Monster Media 1994 #2/Monster Media No. 2 (Monster Media)(1994).ISO/os2/dcf212.zip/DCF2.INF

OS/2 Help File | 1994-07-01 | 114KB | 2,808 lines

ΓòÉΓòÉΓòÉ 1. Table of Contents ΓòÉΓòÉΓòÉ

The DCF/2 Online Help covers the following topics.  Click on the highlighted
topic to get help.

     o Introduction
     o "The Big Picture"
     o Installation
     o DCF/2 and System Startup
     o OS/2 File Systems
     o User Reference
     o VDU Maintenance
     o Troubleshooting
     o Glossary of Terms
     o Appendix


ΓòÉΓòÉΓòÉ 2. Introduction ΓòÉΓòÉΓòÉ

The DCF/2 is an "on-the-fly" disk compression facility which allows you to
increase the effective data storage capacity of your OS/2 computer system.  The
DCF/2 is unlike the traditional "on-the-fly" data compression products
available to DOS users.

Unlike DOS compression products, which require you to pre-allocate the total
size of the compressed drive -- the compressed drives you create using the
DCF/2 grow dynamically.

For example, when you create a 100MB compressed drive and format it, it
occupies less than 350K of physical space.  You can create your first "VDU"
even if you are down to your last few megabytes of physical space.

Unlike DOS compression products, the DCF/2 does not automatically compress the
contents of the "host" drive.  Instead, you decide what you want to move to
compressed storage.  As you move your data onto your "VDU", you recover
physical space on its "host" drive.

Unlike DOS compression products, DCF/2 compressed drives are formatted using
OS/2's High Performance File System.  With the DCF/2, you can experience the
speed and efficiency of this powerful file system without reformatting or
repartitioning your existing physical hard drive.

Unlike DOS compression products, DCF/2 compressed drives can reside on any
device supported under OS/2 -- network and removeable media (read-write
opticals, magneto opticals and floppies, etc.) included!

Unlike DOS compression products, the DCF/2 is a full 32-bit utility -- designed
to grow with your OS/2 desktop.


ΓòÉΓòÉΓòÉ 2.1. The DCF/2 and OS/2 Version Support ΓòÉΓòÉΓòÉ

The DCF/2 does not support versions of OS/2 prior to OS/2 2.0.  If you are not
sure which version of OS/2 is on your system, you can query OS/2.  Go to an
OS/2 window or full screen and type:  SYSLEVEL

If you are running a version of OS/2 prior to OS/2 2.11 (OS/2 2.1 plus the
Service Pak), only non-HPFS based physical media can serve as "host" drives for
your VDUs.  To place DCF/2 VDUs on your HPFS-formatted partitions, your base
operating system must be OS/2 2.11.

To order the Service Pak, call IBM at [phone].

DCF/2 Virtual Disk Units are always formatted as HPFS volumes.  If you do not
currently have the High Performance File System installed on your system, the
DCF/2 installation program will install the correct version for you, based upon
the version of OS/2 running on your system.

     o OS/2 2.11 and HPFS Installed
     o OS/2 2.11 No HPFS.IFS Installed
     o OS/2 2.0 or 2.1 No HPFS Installed
     o OS/2 2.0 or 2.1 and HPFS Installed


ΓòÉΓòÉΓòÉ 2.1.1. OS/2 2.11 and HPFS Installed ΓòÉΓòÉΓòÉ

If you are running OS/2 2.11 and the High Performance File System is installed,
but the version is older than the one shipped on the DCF/2 distribution
diskette, the DCF/2 installation program will make a backup copy of your
existing file and then replace it with the HPFS.IFS dated April 19, 1994.


ΓòÉΓòÉΓòÉ 2.1.2. OS/2 2.11 No HPFS.IFS Installed ΓòÉΓòÉΓòÉ

If you are running OS/2 2.11 and the High Performance File System is not
currently installed on your system, the DCF/2 install program will install the
OS/2 2.11 UHPFS.DLL and the HPFS.IFS dated the April 19, 1994, to the correct
directory and will add the HPFS statement to your CONFIG.SYS.  (If your
existing HPFS file is later than April 19, 1994, it is left unchanged.)


ΓòÉΓòÉΓòÉ 2.1.3. OS/2 2.0 or 2.1 No HPFS Installed ΓòÉΓòÉΓòÉ

If you are running version 2.X of OS/2 but prior to 2.11 and do not have the
High Performance File System installed, the DCF/2 installation program will
install the OS/2 2.1 GA UHPFS.DLL and HPFS.IFS and insert the HPFS statement in
your CONFIG.SYS file.


ΓòÉΓòÉΓòÉ 2.1.4. OS/2 2.0 or 2.1 and HPFS Installed ΓòÉΓòÉΓòÉ

Finally, if you are running version 2.X of OS/2 but prior to 2.11, have the
High Performance File System installed and have partitions formatted as HPFS,
the HPFS will be left unchanged.  IN THIS CASE, DO NOT CREATE DCF/2 VIRTUAL
DISK UNITS ON YOUR HPFS FORMATTED PARTITIONS -- USE ONLY FAT-BASED HOSTS.

The remainder of this introduction will present a few of the basic terms that
you will encounter frequently throughout this document.


ΓòÉΓòÉΓòÉ 2.2. Basic Terms ΓòÉΓòÉΓòÉ

Installing the DCF/2 is easy.  Before you do so, however, you need to have a
basic understanding of the terms we use to describe the differences between the
three types of storage units -- physical, logical and virtual.  (Sound scary?
It's not.)

Physical Disk Unit

Your hard disk or hard drive is a Physical Disk Unit (PDU).  You can reach out
and touch it.  You use low level utilities like FORMAT and CHKDSK on it.  It
may have one or more "logical" partitions.

Logical Disk Unit

A network drive is a Logical Disk Unit (LDU).  You cannot reach out and touch
it.  You cannot perform physical operations on it.  You cannot run low level
utilities like FORMAT and CHKDSK on it.

Virtual Disk Unit

A DCF/2 Virtual Disk Unit (VDU) looks like a real, physical disk unit to OS/2.
It has real geometry (so many heads, so many sectors per track). You run low
level utilities like FORMAT and CHKDSK on it.  It does not exist in the
physical sense.  It "exists" as a "storage container" for your compressed data
on either a physical or a logical disk unit.


ΓòÉΓòÉΓòÉ 3. The DCF/2 Big Picture ΓòÉΓòÉΓòÉ

The DCF/2 is an on-the-fly data compression facility for all OS/2 file systems.
Transparent to all standard DOS, Windows, and OS/2 applications software, the
DCF/2 works with all existing disk structures -- NO repartitioning of your
existing system is needed.

The DCF/2 is a full 32-bit program for OS/2 2.X.  The DCF/2 supports all OS/2
file systems as host storage for compressed, HPFS-formatted virtual disk units
(VDUs), so long as you are running OS/2 2.11 or greater.  For users running
OS/2 2.0, OS/2 2.1 or or OS/2 for Windows, only FAT-based host storage is
supported.  For the  OS/2 2.11 user, the host drive can be an existing FAT or
HPFS partition, a network drive -- even removable media like floppies or
read/write or magneto optical drives.

The DCF/2 is a system of building blocks designed to grow with your entire
operating environment -- IBM's OS/2 2.1 32-bit multitasking makes it all
possible!

The following topics are covered in this section:

     o Product Architecture
     o How It Works
     o What is a "VDU"?
     o Compression


ΓòÉΓòÉΓòÉ 3.1. Product Architecture ΓòÉΓòÉΓòÉ

The following diagram of the DCF/2's architecture details these building
blocks:

                             The DCF/2 Architecture

The DCF/2 is designed with each element externalized.  Third-party developers
can add compression, encryption, and other disk related capabilities to your
system environment (contact the PSC technology lab for pricing and details of
the DCF/2 CDE API kit).


ΓòÉΓòÉΓòÉ 3.2. How It Works ΓòÉΓòÉΓòÉ

When the OS/2 operating system or an application program requests disk
accesses, the DCF/2 Physical Device Driver (PDD) receives the request and
repackages it for processing by the Ancillary Control Process (ACP).  The ACP
is a standard, high-level software layer which shuffles the compressed disk
request between Compression/Decompression Engines (CDE's), Input/Output Engines
(IOE's), and physical disk structures.

The ACP compressed disk requests are processed and managed by standard OS/2
disk and file services.  The DCF/2 can use all logical media, such as hard disk
drives, LAN network drives, and removable media like floppies.  This
architecture guarantees compatibility with all OS/2 system and application
software updates.

The DCF/2 VDU Control Process initializes all VDUs during OS/2 system startup
and then launches the DCF/2 space manager.  The latter monitors the amounts of
virtual and physical space in use to prevent the user from running out of
physical space on the host volume.

The DCF/2 benefits from all OS/2 file and memory management features, so that
applications "see" the DCF/2 VDU as a "real" disk.

The DCF/2 takes advantage of the OS/2 High Performance File System, allowing
DCF/2 VDU's to utilize all of its advanced features like 254 character file
names, integrated extended attributes, and support for HUGE disks.


ΓòÉΓòÉΓòÉ 3.3. What is a "VDU"? ΓòÉΓòÉΓòÉ

"VDU" is short for "Virtual Disk Unit."  If you think in terms of the types of
drives you work with, they are usually either "physical" or "logical."

A physical drive is one you can reach out and touch. You use low level
utilities, like FORMAT and CHKDSK, on a physical drive.  A network drive is an
example of a logical disk unit.  You cannot touch it.  And you cannot run low
level utilities, like FORMAT and CHKDSK, on it.

A "Virtual Disk Unit" is a cross between the two.  Like a network drive, it is
logical rather than physical.  Like a physical drive, you use low level
utilities, like FORMAT and CHKDSK, on it.

In reality, a VDU is a flat, simple file with no EAs (extended attributes), in
which your data is stored in compressed format. Because it is just a flat file,
it can reside on any device supported by OS/2 -- be that FAT, HPFS, network or
removable media.


ΓòÉΓòÉΓòÉ 3.4. Compression ΓòÉΓòÉΓòÉ

There are two basic kinds of data compression:  (1) Lossless and (2) Lossy.
Lossless data compression requires that whatever goes into the compression
engine comes out in the same form.  Lossy compression allows for statistical
recovery of information, allowing data dilution.  The DCF/2 supports only
lossless data compression technologies.

Uncompressed sectors are passed through the DCF/2's character based compression
engine.  The resulting logical disk sectors (LDS) require less physical space
than their uncompressed counterparts.

Each virtual disk unit has an intelligent disk allocation table (DAT) which
describes where compressed logical disk sectors reside within the container
file.  In addition, the DAT keeps track of the compression type performed on
each compressed chunk and how many times the chunk has been accessed,
compressed, and/or decompressed.  Your VDU develops a  personality of its own
as it matures, based upon the way you use it.

     o What to Compress
     o Compressing Compressed Files
     o What Not to Compress
     o Compressing OS/2 Itself


ΓòÉΓòÉΓòÉ 3.4.1. What to Compress ΓòÉΓòÉΓòÉ

The DCF/2 includes a utility called the "Disk Compression Analysis Tool" or
"DCAT."  It allows you to look at the data on your system in terms of the
amount of space storing the data on a virtual disk unit will return to you.

You can use the DCAT to look at your whole physical disk unit or at directories
and subdirectories on your logical drives.  You can sample data in a variety of
ways depending upon your needs.

In general, you will find that user files compress best.  For example, Lotus
AmiPro user files compress at about 5:1.  Windows and DOS program files
compress next best -- usually at 2:1 and better.  Game files compress poorly at
1.5:1.

For detailed information about specific programs and file types, please refer
to the Appendix in your copy of the Disk Compression Facility for OS/2
Introduction


ΓòÉΓòÉΓòÉ 3.4.2. Compressing Compressed Files ΓòÉΓòÉΓòÉ

Some files won't compress or will compress very little.  These include files
you have archived with utilities like ZIP(tm), PKZIP(tm), ARC(tm), and
LHARC(tm), and files that are shipped already compressed -- for example, game
and sound files.  While they do not compress particulary well, you can still
move these to a VDU.


ΓòÉΓòÉΓòÉ 3.4.3. What Not to Compress ΓòÉΓòÉΓòÉ

Some files should not be compressed at all.  For example, all files needed to
boot your system must be left uncompressed, because they are required before
your compressed virtual disk units are available.  For more information on
compressing OS/2, refer to the following section on (Compressing OS/2 Itself.)

You should leave uncompressed files you want access to if you use Dual Boot or
Boot Manager to boot an operating system other than OS/2.  Data stored on your
DCF/2 virtual disk units is not accessible when you boot native DOS.


ΓòÉΓòÉΓòÉ 3.4.4. Compressing OS/2 Itself ΓòÉΓòÉΓòÉ

The operating system (OS/2) is like a puzzle which rebuilds itself each time
you "reboot" your system.  It does so in phases.  The first is system
initialization.  The second is system startup.

During system initialization, base device drivers, device drivers, and basic
system-wide information are loaded.  The DCF/2 physical device driver
(DCF2PDD.SYS) loads at this time.

During system startup the operating system loads high-level file services, user
interface and management programs (Presentation Manager), and initializes
user-specific actions (STARTUP.CMD and STARTUP FOLDER). The DCF/2 ancillary
control process (DCF2ACP.EXE) and its associated support processes load at this
time.

Those parts of OS/2 required prior to the time when OS/2 loads the DCF/2 device
drivers and executes the CALL statement to startup the DCF/2 cannot be stored
on a compressed drive.

Our recommendation is that you allocate to OS/2 the space it requires and
compress your applications software, utilities, user files and things like
icons, clipart and communications threads, etc.

That said, you can move some parts of OS/2 to a VDU and run them quite
successfully.  For example, you can move WINOS2 to a VDU to free up about 8MB
of space on your OS/2 boot drive. When you do so, you must modify the OS/2 PATH
and DPath statements to properly reference the new WINOS2 subdirectory.  Also
modify the AUTOEXEC.BAT file to point to the new WIN\OS2 directory.

If you installed them, you can also gain additional space on your OS/2 boot
drive by moving EPD (the Enhanced Editor) and OS/2 reference files (.INF) to a
VDU.


ΓòÉΓòÉΓòÉ 4. Installation ΓòÉΓòÉΓòÉ

The installation process includes creating VDUs, copying the DCF/2 program
files to a target directory, updating your CONFIG.SYS file and restarting your
system.

Note:  The DCF/2 Version 1.2 installation program should only be used to
       install the DCF/2 programs and create your first VDUs.  It is not
       intended to be used to create additional VDUs or to update VDUs created
       under previous versions of the DCF/2.

 If you currently have VDUs installed that were created using Version 1.1a of
 the DCF/2, please refer to the appendix for converting these VDUs to Version
 1.2.

 Note:  Attention network clients:  If you use a LAN and the LAN drives letters
        you use are adjacent to your first physical drive letter, they will
        have to be moved to after the VDU drive letters.  Drive letter swapping
        is not available in this release, but will be included in a future
        version of the software.  If you have network drives defined, please
        logoff of the network prior to running the DCF/2 install program.

 The section on installation covers the following topics:

     o Choosing the Target Drive
     o Selecting the Number of VDUs
     o Creating VDUs
     o Updating the Configuration
     o DCF/2 Icons & README
     o Restarting Your System
     o Formatting VDUs with AutoFormat
     o AutoChecking VDUs
     o Formatted, Clean and Ready for Data
     o DCF/2 Icon
     o Installing from a Network Server
     o Updating Workstation from a Server
     o Registration

 The DCF/2 installation program can be run from the DCF/2 distribution diskette
 in either your A: or B: drive.

 Network workstations will copy the DCF/2 distribution files from a directory
 on their server to a temporary directory on the workstation and run the
 installation program from the temporary directory.

 If the DCF/2 distribution files have been downloaded from an online service to
 a temporary directory, the install program will be run from that directory.

 Note:  Do not name the temporary directory DCF2.  Doing so will cause the
 installation to fail.

 To run the DCF/2 Installation program, change to the source drive (or
 temporary directory) and type:  INSTALL.


ΓòÉΓòÉΓòÉ 4.1. Choosing the Target Drive ΓòÉΓòÉΓòÉ

The "DCF/2 Installation" screen asks you to select the "Target Drive" for the
DCF/2 program files.  This is the uncompressed drive from which OS/2 will run
the DCF/2 programs.


ΓòÉΓòÉΓòÉ 4.2. Selecting the Number of VDUs ΓòÉΓòÉΓòÉ

On the "DCF/2 Installation" screen you will enter the "Total VDUs" to be
created by the install program.  This number can be changed at a later  time.

The DCF/2 allows you to create as many or as few VDUs as suit your needs.  No
two systems are alike.  Some users have a single C: drive.  Other users have
two physical drives divided into multiple logical partitions.  Still others
have network drives, CD-ROMs and Read/Write or Magneto Optical devices
installed.

The DCF/2 allows you to choose whether to create a VDU for each logical
partition or device, or to create several small VDUs on a single partition.

In choosing the number of VDUs to create, you need to look at the partition(s)
and devices you have on your computer and the kind of data you store on them.
The data on a system usually falls into one of three categories and occupies
more or less a fixed percentage of the physical space:


Data Categorized by Frequency of Use

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéCategory                 ΓöéAs % of Physical    ΓöéExamples                 Γöé
Γöé                         ΓöéSpace               Γöé                         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéWrite seldom/Read seldom Γöé60 %                ΓöéIcons, .pic files,       Γöé
Γöé                         Γöé                    Γöécommunications threads,  Γöé
Γöé                         Γöé                    Γöétutorials, online        Γöé
Γöé                         Γöé                    Γöéarchives, database       Γöé
Γöé                         Γöé                    Γöébackups, etc.            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéWrite seldom/Read often  Γöé25%                 ΓöéApplications             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéWrite often/Read often   Γöé15%                 ΓöéLive data                Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Typically, applications and games compress at 1.5 - 1.75:1, user files compress
at 1.75 - 2.25:1 and icons and communications threads compress at 2.25 - 5.0:1.

Note:  The DCF/2 is shipped with a complete disk compression analysis tool
(DCAT).  This easy-to-use utility allows you to measure precisely how your
files, directories and sub-directories will compress before you move anything.
We encourage you to make extensive use to this powerful tool.

If you are using a laptop with a docking station, you may want to create an
additional "dummy" VDU for each of the devices present when docked but missing
when running portable.  (Refer to the section on "Tips & Techniques.")

For a number of reasons, we recommend that you create several smaller VDUs
rather than a few large ones.  We base this recommendation on the length of
time required to run CHKDSK /F on a large VDU versus a smaller one; as well as
the amount of time required to optimize a large VDU versus a smaller one.
Finally multiple smaller VDUs offer greater backup flexibility.


ΓòÉΓòÉΓòÉ 4.3. Creating VDUs ΓòÉΓòÉΓòÉ

The first VDU you create will take the first physical drive letter available on
your system; the second will take next available drive letter, and so on up to
the total number  of VDUs you requested be created. For each VDU, you select
the drive letter for the "Host  Physical Unit for VDU" and the "Total Size in
MB."

Note:  The DCF/2 will allocate its VDU drive letters contiguously from the
       first available physical drive letter on your computer system at the
       time the DCF/2 physical device driver loads.  This means that, for
       example, laptop users with docking stations will probably need to use
       one CONFIG.SYS when docked and a second CONFIG.SYS when running
       portable.  Or, they will use a single CONFIG.SYS and create an
       additional "dummy" VDU to serve as a placeholder for each of the devices
       (like CD-ROMs) that are not there when running in portable mode.  (Refer
       to the section in the Appendix on laptops.)

     o Choosing Where to Put VDUs
     o Selecting the Host Physical Unit
     o Selecting VDU Size
     o Cancelling Selections


ΓòÉΓòÉΓòÉ 4.3.1. Choosing Where to Put VDUs ΓòÉΓòÉΓòÉ

This version of the DCF/2 allows you to create as many virtual disk units as
you have drive letters available.  You can "put" your VDU's on any of your
existing disk units, on network drives, floppies, tape, Read-Write Opticals --
any writeable device supported by OS/2 so long as you are running OS/2 2.11 or
greater.


ΓòÉΓòÉΓòÉ 4.3.2. Selecting the Host Physical Unit ΓòÉΓòÉΓòÉ

The  "Host Physical Unit" is the physical location on which the Virtual Disk
Unit resides.

Note:  If the Host Physical Unit contains the SWAPPER.DAT file, we recommend
       that you preallocate space for the swap file by adjusting the settings
       in your CONFIG.SYS.


ΓòÉΓòÉΓòÉ 4.3.3. Selecting VDU Size ΓòÉΓòÉΓòÉ

The default size is 128 MegaBytes.  This is not based upon an in-depth analysis
of the size of the host physical unit.  It is only there to prevent you from
creating a VDU of no size at all.

A VDU containing a fairly even distribution of user, program and miscellaneous
files (e.g., icons, threads, clipart, etc.) will typically compress at 2:1.  If
you opt to take the default size of 128MB, the VDU when full will occupy about
64MB of physical space on the host drive.

As a rule of thumb, calculate the total virtual space you'll have available as
follows:  Take the total size of your physical drive, subtract from that the
space required by OS/2, the SWAPPER.DAT file and the amount you would like to
reserve for uncompressed storage.  This remainder multiplied by the expected
compression ratio (ECR) equals the estimated total virtual space.

      (Physical space - (OS/2 including SWAPPER.DAT + reserved space))xECR=
                             Estimated Virtual Space

If you plan to store primarily program files and .DLLs --  which typically
compress at about 1.85 - 2:1 -- multiply the remainder by 2 to determine the
size VDU to create.

If you plan to store primarily user files, icons, etc. --  which typically
compress at 2.25 -5:1 -- multiply the remainder by 3 to determine the size of
VDU to create.

You can create a single VDU of a size equal to the estimated total virtual
space.  Or, you can create several smaller VDUs with a combined size equal to
the estimated total virtual space.

We strongly recommend that you create multiple, smaller VDUs rather than a few
larger ones.  Having several smaller VDUs affords you greater control over what
you compress where and also affords you greater flexibility in creating and
maintaining backups of your data.

You enter the size in MegaBytes rather than in bytes.  The "Total Size" is the
total capacity OS/2 will believe the DCF/2 Virtual Disk Unit to have.  You will
want this size to be close to the amount of storage you should get.


ΓòÉΓòÉΓòÉ 4.3.4. Cancelling Selections ΓòÉΓòÉΓòÉ

Once you have indicated your choices, you can choose to "Create or Update
VDU," get "Help," or "Exit/Cancel."  The latter allows you to change your mind
or correct an unwanted choice.

Following the successful creation of your first VDU, the process repeats itself
automatically for each subsequent VDU up to the total number of VDUs you
requested.


ΓòÉΓòÉΓòÉ 4.4. Updating the Configuration File ΓòÉΓòÉΓòÉ

Once your VDUs have been created, the DCF/2 program files are copied to the
"Target Drive" and the install program adds the DEVICE, SET and CALL statements
to your configuration file.

Automatic Update

The install program creates the CONFIG.DCF file. This file will replace your
existing CONFIG.SYS.  First, however, your existing CONFIG.SYS is saved as
CONFIG.!D!.

The install program includes an edit option to allow you to edit the load order
of devices in your CONFIG.SYS before completing the installation process and
restarting your system.  In most cases, you will not need to do so.

Whenever the DCF/2 makes a change to your CONFIG.SYS file, that change will
always be delimited by lines and REM statements which explain what was changed
and the date and time stamp of the change.

     o Example of Changes to the CONFIG.SYS File


ΓòÉΓòÉΓòÉ 4.4.1. Example of Changes to the CONFIG.SYS File ΓòÉΓòÉΓòÉ

The order of the statements in the CONFIG.SYS file has been adjusted to put the
HPFS.IFS statement at the top, followed by the DISKCACHE statement if there are
FAT-formatted drives.  This is followed by the original CONFIG.SYS statements,
(with the earlier HPFS and DISKCACHE statements REM'd out with a time stamp),
followed by the DCF/2 virtual disk definitions, followed by DCF/2 call
statement:

where x: is the target drive to which you installed the DCF/2 programs.

     CALL=x:\DCF2\DCF2.EXE /A:STARTUP

 The HPFS and (optionally) DISKCACHE statement(s) may have been modified to
 optimize the cache allocation and/or to add AUTOCHECK switches.

 The DCF/2 requires that the HPFS.IFS have a minimum cache of 1024.  In the
 following example, the /CACHE parameter determines the number of KiloBytes of
 memory allocated to HPFS cache blocks.  The /AUTOCHECK tells the HPFS to
 CHKDSK any 'dirty' HPFS disks:

     IFS=C:\OS2\HPFS.IFS /CRECL:64 /CACHE:1536 /AUTOCHECK:FEG

 "Dirty" disks result from improperly shutting down OS/2.  This can be the
 result of voluntary action on the user's part -- turning off the computer with
 out running shut down. Or, this can result from an involuntary action -- a
 system TRAP or system hang, or a power failure.

 The DISKCACHE statement is required only if there are FAT drives on the
 system.  If there are no FAT formatted drives, this statement is REM'd out
 thereby freeing up the memory it would have otherwise committed.

 In the following DISKCACHE statement, the first number is the number of
 KiloBytes allocated to FAT caching.  The LW parameter enables FAT
 lazy-writing, the number following that is the threshold, and the AC:
 specifies which FAT drives to CHKDSK during system startup.  For additional
 information on the DISKCACHE statement, refer to the OS/2 Online Help.

     DISKCACHE=1024,LW,32,AC:C

 The following commands can improve the system's caching performance, depending
 upon how the system is used:

     REM >> RUN=x:\OS2\CACHE.EXE /MAXAGE:40000
     REM >> RUN=x:\OS2\CACHE.EXE /DISKIDLE:30000
     REM >> RUN=x:\OS2\CACHE.EXE /BUFFERIDLE:20000

 Due to the multithreaded nature of the OS/2 system startup, the user may need
 to place the above RUN commands in the STARTUP.CMD folder instead of in the
 CONFIG.SYS.

 The contents of the CONFIG.SYS file follow these statements and these are
 followed by the DCF/2 device, set and call statements at the end of the
 CONFIG.SYS.  The DCF/2 statements will be commented and surrounded with
 delimiting lines.

 The DCF/2 device drivers are order dependent and each must appear on a
 separate line.  The DCF2PDD.SYS comes first.  The /U:n defines n number of
 DCF/2 virtual disk units to be created.

     DEVICE=C:\DCF2\DCF2PDD.SYS /u:3
     DEVICE=C:\DCF2\DCF2CDE.SYS

 The DCF_VDU_x environment variable points to DCF/2 VDU x:

     SET DCF2_VDU_E=C:\DCF2\DCF2_E.VDU
     SET DCF2_VDU_F=C:\DCF2\DCF2_F.VDU
     SET DCF2_VDU_G=C:\DCF2\DCF2_G.VDU

 The following DCF/2 diagnostic statements are to aid in diagnosing virtual
 drive characteristics and problems:

     REM >> SET DCF2_ACP_LOGNG=3
     REM >> SET DCF2_VCP_LOGNG=3
     REM >> SET DCF2_ACP_DEBUG=3
     REM >> SET DCF2_VCP_DEBUG=3

 The "CALL=" statement starts the DCF/2.  If you have put DCF/2 virtual disk
 units on network disks or other media which is not available at boot time,
 move this statement to the STARTUP.CMD or to the command procedure that starts
 your network.

 The following call statement tells OS/2 to startup the DCF/2:

     CALL=C:\DCF2\DCF2.EXE /A:STARTUP

 The REM'd statements and delimiting lines may be deleted if you prefer. Do,
 however, exercise caution so as not to delete more than the comments.


ΓòÉΓòÉΓòÉ 4.5. DCF2 Icons and README.12 ΓòÉΓòÉΓòÉ

DCAT and Online Help Icons

During the final part of the installation process, the program will place the
DCAT and DCF/2 Online Help icons on your desktop and display the DCF/2 README
file.  It will then ask if you would like to restart your system at this time.

README.12

The README.12 file shipped on the DCF/2 disk contains the latest release notes
for this version of the software.  You can elect to have both the README.1st
and README.12 copied to the DCF/2 program directory when you run the DCF/2
install program.  Regardless, you will have an opportunity to view the file
automatically just prior to exiting the DCF/2 install program and restarting
your system.


ΓòÉΓòÉΓòÉ 4.6. Restarting Your System ΓòÉΓòÉΓòÉ

The DCF/2 device statements added to your CONFIG.SYS will not take effect until
such time as your system is restarted.

Before exiting the DCF/2 install program, the program will ask you if you would
like to have your system restarted automatically at this time.  If you answer,
"yes," the install program will run shutdown. You can choose to exit the
program and do the reboot later.

Once you have successfully created your VDUs and your system has been rebooted,
each of your VDUs will automatically be formatted using the HPFS format.  On a
standard OS/2 system, this will happen prior to the time OS/2 loads the
Workplace Shell.


ΓòÉΓòÉΓòÉ 4.7. Formatting VDUs with AutoFormat ΓòÉΓòÉΓòÉ

The VDUs you created during the install are unformatted until your system
restarts; then the DCF/2 uses the OS/2 format command to format each of them as
HPFS drives, automatically.

The format uses an undocumented OS/2 2.1 feature -- the NOF switch -- for fast
format.  In most cases, the NOF format works fine.  If, for some reason, it
does not seem to work on your system, answer "no" at the format prompt.  Format
will then run on the VDU without the switch.

The formatting process can take from a few seconds using the switch to a couple
of minutes without it, depending upon the size of the drive being formatted and
the speed of your computer.

The format command will prompt you to enter a volume label or press enter.  At
this point, the volume information is written to the VDU's boot record.


ΓòÉΓòÉΓòÉ 4.8. AutoChecking VDUs ΓòÉΓòÉΓòÉ

The DCF/2 uses OS/2's CHKDSK /F to check the newly formatted drive.  Be sure to
"press any key to continue" when prompted to do so!  This process repeats for
each of the VDUs you created during the installation program.


ΓòÉΓòÉΓòÉ 4.9. Formatted, Clean and Ready for Data ΓòÉΓòÉΓòÉ

The DCF/2 startup continues, the DCF/2 Space Manager is launched for each VDU
and the Workplace Shell comes up.  At this point, your VDUs are formatted,
empty and available.  You may now begin to move data and user files onto them
-- using the tools you normally use to move directories and files on your
system.


ΓòÉΓòÉΓòÉ 4.10. Shut Down ΓòÉΓòÉΓòÉ

As of Version 1.2, the DCF/2 shut down is completely integrated with OS/2's
standard "right mouse button" shut down.  If you have a DCF/2 System Shutdown
icon on your desktop, you should delete it.


ΓòÉΓòÉΓòÉ 4.11. Installing from a Network Server ΓòÉΓòÉΓòÉ

You can install the DCF/2 to a central location on a server. First, make a
directory on the server, e.g., DCF2DIST; then copy the DCF/2 program files to
that directory.

     COPY A:*.* P:\DCF2DIST\*.*

 In the above example, the DCF/2 disk is in your A: drive and you are copying
 the files to a directory called DCF2DIST on server drive P:

 On each workstation, create a temporary directory; then logon to the
 appropriate network drive and change to the DCF2DIST directory.  Copy the
 files from the DCF/2 program directory on the server to the temporary
 directory on the workstation.  (In, the following example, the temporary drive
 "TMP" is on drive "x".)

     COPY  P:\DCF2DIST\*.* x:\TMP

 Important Note:  Do not use "DCF2" as the temporary directory name.

 Important:  Before installing the DCF/2, the workstation must logoff of the
 network.  If this is not done, the first VDU will take an incorrect drive
 letter.

 The client workstation then installs the DCF/2 from the temporary directory,
 by changing to the temporary directory and running the DCF/2 install program.

     X:\TMP\INSTALL


ΓòÉΓòÉΓòÉ 4.12. Updating Workstations from a Network Server ΓòÉΓòÉΓòÉ

When the install program is used to update an existing DCF/2 program area on a
client workstation, only the DCF/2 program files are changed.  This process can
be done directly from the central server and does not require that the client
workstation logoff the network at any time during the procedure.


ΓòÉΓòÉΓòÉ 4.13. Registration ΓòÉΓòÉΓòÉ

Your DCF/2 package includes a registration card.  Please take the time to fill
out your registration card and return it to us so that we can notify you when
updates to the DCF/2 are available.

If you are interested in testing future releases of the DCF/2, please check the
"Beta" test program box.  All registered users who would like to beta test are
eligible to do so.  Access to CompuServe or IBMLink is a required.


ΓòÉΓòÉΓòÉ 5. DCF/2 and Your System Startup ΓòÉΓòÉΓòÉ

At OS/2 system startup (on a standard system running the Presentation Manager),
the DCF/2 startup process will complete before the Presentation Manager comes
up.  The DCF/2 startup process involves scanning all of the VDUs, formatting
and/or running CHKDSK on any VDUs that are either unformatted or were left
"dirty" by an improper shut down, and launching the space manager.

Normally, during startup, the DCF/2 audio and screen messages are enabled.  The
default setting for the count-down (the interval during which the keyboard is
enabled to receive a user-entered SHIFT or CONTROL key) is 10 seconds.  These
can be disabled by adding the appropriate optional parameter to the CALL=
statement which starts the DCF/2 from your CONFIG.SYS.  Refer to the Command
Reference in the Appendix for a list of optional parameters.

You can use CONTROL-C to terminate the AUTOCHECK process.  However, as a
safeguard, the VDU remains "dirty" until you run CHKDSK /F on it -- even if you
run a proper shut down in between.

If you find you want to interrupt the startup process, you can.  When prompted,
depress the CONTROL key to launch an OS/2 command processor.  To resume the
startup process, type:  EXIT.

Far less often, you may find you need to keep the DCF/2 from loading at all. If
you feel the DCF/2 is somehow interfering with your boot process, you can
prevent even the DCF/2 device drivers from loading.  Depress one or both SHIFT
key(s) shortly after the OS/2 "Loading, please wait" startup message under the
big OS/2 logo.  OS/2 will not load the DCF/2 device drivers.  Note:  Your VDUs
will not be available until you restart your system or until you manually start
the DCF/2 processes with the command:

     X:\DCF2\DCF2.EXE /A:STARTUP

 If your system is improperly shut down -- you turn it off without running the
 OS/2 shut down, you have a power failure, or your system experiences a trap or
 the system hangs necessitating a reboot -- the DCF/2 will automatically run
 CHKDSK /F on each VDU during the boot process.  This checks your VDUs for
 errors and makes the necessary repairs.  It keeps you from causing further
 damage to a damaged VDU.

 The remainder of this section covers startup on your system of the:

     o The DCF/2 Device Drivers
     o The DCF/2 Control Program
     o The DCF/2 VDU Control Process
     o The DCF/2 Ancillary Control Process


ΓòÉΓòÉΓòÉ 5.1. The DCF/2 Device Drivers ΓòÉΓòÉΓòÉ

The DCF/2 is not designed as an IFS (installable file system).  The DCF/2
install program placed two device drivers in your CONFIG.SYS file.  OS/2 loads
these at system startup.

The DCF2PDD

The DCF/2 Physical Device driver defines a block device in your CONFIG.SYS that
"creates" your compressed drive.  It must load in your CONFIG.SYS prior the
DCF2CDE.SYS.

The DCF2CDE

The DCF/2 Compression Decompression Engine (DCF2CDE.SYS) is a character-based
device driver.  As requested data is passed to it, it compresses or
decompresses that data.


ΓòÉΓòÉΓòÉ 5.2. The DCF/2 Control Program ΓòÉΓòÉΓòÉ

OS/2 runs the DCF/2 Control Program each time your system starts up.  It is
also the command line interface for both PM and non-PM systems.  You will use
it if you want to create or remove VDUs once you have installed the DCF/2 and
created your initial VDUs.

The CALL statement the DCF/2 install program inserted at the end of your
CONFIG.SYS, calls the DCF/2 control program, which in turn lauches the DCF2VCP
and DCF2ACP programs.

Refer to the appendix for a list of DCF2.EXE commands and parameters.


ΓòÉΓòÉΓòÉ 5.3. The DCF/2 VDU Control Process ΓòÉΓòÉΓòÉ

The DCF/2 VDU Control Process (DCF2VCP) performs two functions.  First, it
creates the control processes run during your system's startup.  It initializes
the disks.  Then, during run-time, it controls space management for each VDU
using the DCF2INFO.CMD file.

Space Manager File

Each VDU has a DCF/2 Space Manager File, DCF2INFO.CMD.  This file reports the
VDU's current compression ratio and available compression ratio after
recompaction.  This file also reports the total size of, amount of space in use
by and space available for both the VDU's physical host drive and for the VDU
itself.

The purpose of this file is to protect you from running out of physical space
on the VDU's host drive -- a condition which can jeopardize the integrity of
the VDU.  The file may appear to be very large at times.  In reality, it
occupies very little space and is stored in the VDU's Disk Allocation Table in
single-byte entries.

To display the file, go to an OS/2 command prompt and type the VDU drive letter
followed by a colon and DCF2INFO, e.g., X:DCF2INFO.  If you are not in the
root, use \X:DCF2INFO, where X is the drive letter for the VDU.  To exit, type
Control-C.


ΓòÉΓòÉΓòÉ 5.4. The DCF/2 Ancillary Control Process ΓòÉΓòÉΓòÉ

The DCF/2 Ancillary Control Process (DCF2ACP) is the software controller for
the virtual disk drive.  It connects drive letter X to the VDU container file.
For example, you might have a VDU drive letter E: and a VDU container file
C:\DCF2\DCF2_E.VDU.  The DCF2ACP "connects" the two.

While you will need to do so only infrequently -- for example, to delete a VDU
container file or to update the DCF/2 program files -- you can easily stop and
start the DCF2ACP using the DCF/2 Control Program.  To try it, change to your
DCF2 program directory, type DCF2 /A:SHUTDOWN to stop the DCF2ACP and DCF2
/A:STARTUP to restart it.

Note:  If the DCF2ACP is stopped, your VDUs and the programs and data on them
       are not available.  This makes sense if you think in terms of your
       physical disk controller -- were you pull your physical disk controller
       out of your computer, the programs and files on your physical disk would
       not be available!


ΓòÉΓòÉΓòÉ 6. OS/2 File Systems ΓòÉΓòÉΓòÉ

A file system determines how data is stored on your disk.  OS/2 supports two
basic file systems:  FAT and HPFS.  The key difference between the two file
systems is the way in which they manage the date stored on your disk.

The following topics are covered in this section:

     o The FAT File System
     o The HPFS File System
     o HPFS vs. FAT Summary
     o DCF/2 and the OS/2 File Systems
     o Floppies
     o Physical Drive Management
     o Virtual Drive Management
     o Backing Up Data


ΓòÉΓòÉΓòÉ 6.1. The FAT File System ΓòÉΓòÉΓòÉ

The FAT file system stores data using clusters.  The size of the cluster used
depends upon the size of the drive.  Typically, the cluster size is 4 Kbytes;
but as the size of the drive increases, the size of the cluster increases to 8
or even 16Kbytes.  This increase is due to the limitation on the maximum number
of entries that can be supported by the File Allocation Table (64K entries).

The FAT supports only the "eight-dot-three" convention for file names.  That
is, file names can use up to eight alphanumeric characters followed by a period
and an extension of three alphanumeric characters, e.g., MYFILE.DOC,
TESTFILE.WK1.


ΓòÉΓòÉΓòÉ 6.2. The HPFS File System ΓòÉΓòÉΓòÉ

The High Performance File System or HPFS stores data at sector granularity --
512 bytes per sector.  The HPFS includes sophisticated caching and lazy writing
mechanisms.  Finally, the HPFS employs an extremely efficient mechanism for
searching file directories.

It supports file names up to 254 characters in length, providing the user with
the ability to use far more descriptive file names than the eight character
plus three character extension available using FAT.


ΓòÉΓòÉΓòÉ 6.3. HPFS vs. FAT Summary ΓòÉΓòÉΓòÉ

Statistically over a FAT formatted drive, one half of the cluster size is lost
in slack space.  Actually, it can be worse than that -- especially if you have
a lot of small files, like icons.

An icon is typically slightly less than 1Kbytes big, but a FAT-formatted
partition, with a minimum cluster size of 4Kbytes will require 4Kbytes to store
this 1Kbyte file.  If you store 4,000 1K big icon files on a FAT partition, you
will use 16MB -- 12MB of the 16MB are lost in slack space!

To store the same 1K icon file on an HPFS-formatted drive requires only 1024
bytes.  To store the same 4,000 1Kbyte big icon files that required 16MB on a
FAT-formatted partition, requires only 4MB on an HPFS-formatted volume!  You
recover 12MB of physical space simply by storing the files on an HPFS rather
than a FAT formatted volume.

The HPFS also offers several other benefits.  Among these are a highly
efficient binary-tree search mechanism, ability to use up to 254 characters for
file names, and optional cache tuning parameters which can improve system
performance by 25 to 30%.


ΓòÉΓòÉΓòÉ 6.4. DCF/2 and the OS/2 File Systems ΓòÉΓòÉΓòÉ

DCF/2 VDUs are formatted using the OS/2 High Performance File System (HPFS).
Based upon extensive comparisons of the two file systems, we have concluded
that an HPFS-formatted drive is faster and more efficient than the equivalent
size FAT (File Allocation Table) formatted drive -- independent of the size of
the drive.


ΓòÉΓòÉΓòÉ 6.5. Floppies ΓòÉΓòÉΓòÉ

A floppy drive is DASD device.  It is always formatted to use the File
Allocation Table.  Using the DCF/2, you can put HPFS-formatted VDU's on
FAT-based floppy devices.


ΓòÉΓòÉΓòÉ 6.6. Physical Drive Management ΓòÉΓòÉΓòÉ

It is important to take 'good care' of your physical disk storage before doing
anything with DCF/2 virtual disk units.  This is because the virtual disk units
reside on physical storage and if the physical storage is damaged or corrupted
in some way, that can cause unnecessary risk to the virtual disk container
file.

In most cases, the only thing you have to do to maintain your physical disk
integrity, it to make sure you 'AUTOCHECK' your physical disk drives at startup
time.  The DCF/2 installation procedure automatically insures this by
correcting the IFS= and DISKCACHE= CONFIG.SYS statements, if the AUTOCHECK
option is not already there.

If you do experience a physical disk integrity problem make sure you shut down
properly and then make sure that the CHKDSK operation is performed during
system restart.


ΓòÉΓòÉΓòÉ 6.7. Virtual Drive Management ΓòÉΓòÉΓòÉ

DCF/2 virtual disk units should be treated exactly as you do physical disk
units, (except that, as noted above) the physical disk management MUST be
performed BEFORE any DCF/2 virtual disk maintenance.


ΓòÉΓòÉΓòÉ 6.8. Backing Up Data ΓòÉΓòÉΓòÉ

The DCF/2 virtual disk units offer you a great deal of backup flexibility. You
can back up the VDU's host drive, and, in so doing, create an image back up of
the VDU container file.  Or, you can back up the individual files on the VDU,
file-by-file.

In either case, the important point is that you do back up your data (both
physical and virtual).  Disk drives are mechanical things -- eventually they
are going to fail; so don't put this important system management function off
until it's too late!

     o Image Back Up
     o File-by-File Back Up


ΓòÉΓòÉΓòÉ 6.8.1. Image Back Up ΓòÉΓòÉΓòÉ

You can back up the VDU container file itself and have an 'image' backup of the
compressed volume.  Before you do an 'image' backup, you must stop the DCF2ACP.
Otherwise, the VDU container file is locked open.  (If you get an error doing a
back up of the VDU's host drive, this is the most likely cause.)

To stop the DCF2ACP, use the following command:

     DCF2 /A:SHUTDOWN

 After you complete an image back up, restart the DCF2ACP using the following
 command:

     DCF2 /A:STARTUP


ΓòÉΓòÉΓòÉ 6.8.2. File by File Back Up ΓòÉΓòÉΓòÉ

You can back up the individual files in the VDU and have file-by-file backup of
your compressed data.  This method provides an uncompressed copy of each file
in the VDU's compressed storage.  Unlike the image back up, during a
file-by-file back up, the DCF2ACP remains running.


ΓòÉΓòÉΓòÉ 7. User Reference ΓòÉΓòÉΓòÉ

The User Reference is divided into the following sections, which describe the
functions and operations of the DCF/2 program modules, as well as how to move
files from physical to virtual space.

     o System Startup
     o Control Program
     o Ancillary Control Process
     o VDU Control Process
     o LED Monitors
     o Shutdown Program
     o Optimize Utility
     o DCAT (Disk Compression Analysis Tool)
     o Moving Files from Physical to Virtual Space


ΓòÉΓòÉΓòÉ 7.1. System Startup ΓòÉΓòÉΓòÉ

During system startup, the DCF/2 is linked to the OS/2 operating system to
provide transparent access to your virtual, compressed disk storage.

The HPFS.IFS

The DCF/2 relies on the OS/2 High Performance File System (HPFS) for all
virtual disk operations.  Normally the IFS= CONFIG.SYS statement will be at the
beginning of your system startup.

The DCF/2 Device Statements

The DCF/2 virtual disk "block devices" are created when OS/2 loads the
DCF2PDD.SYS device driver.  The "/u:" option determines how many template
virtual disk units are created.  These are associated with virtual disk unit
container files using environment strings (see below).

The DCF/2 Environment Strings

The DCF/2 associates a virtual drive unit with it's container file using a
process environment string of the form:

                            DCF2_VDU_x=full_file_path

where "x" is the VDU drive letter to be associated with "full_file_path" file
name.  A full file path is normally "d:\dir\filename.ext."

The CALL=DCF2.EXE

Normally, the DCF/2 is started at the very end of the system CONFIG.SYS using
the CALL= startup statement.  During DCF/2 startup, the system startup can be
interrupted or aborted (as described in the section on System Startup).

Using Startup.CMD instead of CALL=DCF2.EXE

If you have placed DCF/2 VDUs on network drives which are not available during
system startup, move the "CALL=DCF2 /A:STARTUP" statement from the CONFIG.SYS
to your STARTUP.CMD file.  Place it in the STARTUP.CMD after the statements
that start your network software.


ΓòÉΓòÉΓòÉ 7.2. Control Program (DCF2.EXE) ΓòÉΓòÉΓòÉ

OS/2 uses the DCF/2 Control program every time your system starts up.  It is
the program called by the CALL statement, that the DCF/2 installation program
added to the end of your CONFIG.SYS.  The DCF/2 Control program starts the
DCF/2 VDU Control Process and the DCF/2 Ancillary Control Process, which
initialize and check your VDUs at system startup.

You can also use the DCF/2 Control program from the command line from an OS/2
window or full screen.

Using the DCF/2 Control program, you can:

     o Refresh the Space Manager file for VDU x
     o Start the DCF/2 control processes
     o Stop the DCF/2 control processes
     o Create additional VDUs

 To use the program, you must first change to the DCF2 program directory.  Then
 type the DCF2 command followed by at least one parameter.  The command syntax
 is as follows:

 DCF2 /[parameter 1] /[parameter 2] /[parameter 3]

 Most DCF2 commands use only one parameter.  The exception is the command to
 create a new VDU.  In this case, you specify /v:create /s: /f:, where /s: is
 the size of the VDU in megabytes, and /f: is the file specification of the VDU
 you want to create.

 The following table lists the optional parameters available for the DCF2.EXE
 program:


  DCF2 Control Program Command Line Parameters

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéCommand ΓöéParameter             ΓöéFunction                                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/A:STARTUP            ΓöéStarts the DCF/2 Control Processes.     Γöé
  Γöé        Γöé                      ΓöéMakes your VDUs available.              Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/+                    Γöé"Shorthand" method to start the DCF/2   Γöé
  Γöé        Γöé                      ΓöéControl Processes.                      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/A:STARTUP/q          ΓöéStarts the DCF/2 Control Processes      Γöé
  Γöé        Γöé                      Γöéwithout beeps signaling "keyboard       Γöé
  Γöé        Γöé                      Γöéenabled."                               Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/A:STARTUP/Q          ΓöéStarts the DCF/2 Control Processes      Γöé
  Γöé        Γöé                      Γöéwithout beeps signaling "keyboard       Γöé
  Γöé        Γöé                      Γöéenabled" and without writing the DCF/2  Γöé
  Γöé        Γöé                      Γöéstartup messages to the screen.         Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/A:STARTUP/T:n        ΓöéStarts the DCF/2 Control Processes with Γöé
  Γöé        Γöé                      Γöéa count-down of n seconds.  This is the Γöé
  Γöé        Γöé                      Γöéinterval during which the keyboard is   Γöé
  Γöé        Γöé                      Γöéenabled to accept a user entered SHIFT  Γöé
  Γöé        Γöé                      Γöéor CONTROL key to to interrupt the      Γöé
  Γöé        Γöé                      ΓöéDCF/2's load process.                   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/A:Startup /D         ΓöéStarts the DCF/2 Control Processes and  Γöé
  Γöé        Γöé                      Γöésays to delete the DCF2INFO.CMD at      Γöé
  Γöé        Γöé                      Γöéstartup.  Use this option if you run    Γöé
  Γöé        Γöé                      Γöévirus scanning software.  It will       Γöé
  Γöé        Γöé                      Γöéeliminate uncecessary scanning time.    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/A:STATUS             ΓöéReports the Status of the DCF/2 Control Γöé
  Γöé        Γöé                      ΓöéProcesses (currently running or         Γöé
  Γöé        Γöé                      Γöécurrently not running).                 Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/A:SHUTDOWN           ΓöéStops the DCF2 Control Processes.  Your Γöé
  Γöé        Γöé                      ΓöéVDUs are unavailable when you stop the  Γöé
  Γöé        Γöé                      ΓöéDCF/2.  Use this command before you     Γöé
  Γöé        Γöé                      ΓöéOPTIMIZE a VDU or if you need to delete Γöé
  Γöé        Γöé                      Γöéa VDU.                                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/-                    Γöé"Shorthand" method to stop the DCF/2    Γöé
  Γöé        Γöé                      ΓöéControl Processes.                      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/V:CREATE /S: /F:     ΓöéCreates VDU of /S:[size in megabytes]   Γöé
  Γöé        Γöé                      Γöéand /F:[file specification]  (The path  Γöé
  Γöé        Γöé                      Γöéand filename for the VDU container      Γöé
  Γöé        Γöé                      Γöéfile.)                                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2    Γöé/R:X                  ΓöéRefreshes the DCF2INFO file for VDU "X."Γöé
  Γöé        Γöé                      Γöé(Wait 15 seconds before typing the next Γöé
  Γöé        Γöé                      ΓöéX:DCF2INFO.)                            Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


ΓòÉΓòÉΓòÉ 7.2.1. How to Add a VDU ΓòÉΓòÉΓòÉ

For the sake of example, we will use a hypothetical system having a physical
drive C: with a logical partition D:.  We have installed the DCF/2.  During the
installation, we created two VDUs.  These are drives E: and F:

In the example outlined below, we will add a third VDU to our hypothetical
system. The third VDU will take the next available drive letter, G:.  We'll
create G: as a 100MB drive.

The process involves three steps.  First, we will use the DCF/2 Control Program
to create the VDU.  Second, we will make two changes to the DCF/2 statements in
the CONFIG.SYS.  Third, we will reboot or restart the computer.

Create the VDU Container File

To create the VDU, we will first change to the DCF2 program directory.  Then,
we will use the DCF2 /v:create command to create our 100MB VDU G:

     DCF2 /V:CREATE /S:100 /F:D:\DCF2\DCF2_G.VDU

 The parameters used above are /V: (Virtual Disk Unit), /S: (Size in MB) and
 /F: (Path and File Specification).

 Add the VDU Drive Letter

 We will edit the /:u pararmeter following the DCFPDD.SYS statement in the
 CONFIG.SYS file.  The /:u is the total number of virtual disk units, i.e., VDU
 drive letters requested.  To add one VDU drive letter, we will increase this
 number by 1.

 On our hypothetical system, the /u: parameter is currently the number 2. When
 we add the next VDU dirve letter, we increase this number by 1 -- from 2 to 3.

     DEVICE=C:\DCF2\DCF2PDD.SYS /u:3

 At this point, we have a new drive letter, G:, but nothing points to it until
 we add an environment string to associate G: with the VDU container file.  The
 environment strings in the CONFIG.SYS currently look like the following:

     SET DCF2_VDU_E=C:\DCF2\DCF2_E.VDU
     SET DCF2_VDU_F=D:\DCF2\DCF2_F.VDU

 If we want our new VDU G: to reside on D:, then its environment string or
 statement will look like this:

     SET DCF2_VDU_G=D:\DCF2\DCF2_G.VDU

 We save the changes to the CONFIG.SYS and exit the edit session.

 Restart the Computer

 The final step in the process is to restart the computer system.  This
 initializes the changes made to the CONFIG.SYS and runs FORMAT on the new VDU.


ΓòÉΓòÉΓòÉ 7.2.2. How to Delete a VDU ΓòÉΓòÉΓòÉ

If we want to delete or remove the last VDU we created, the procedure involves
four steps.  First, we use the DCF2 program to stop the DCF2 control processes
-- so that we can access the VDU.  Second, we change the DCF2 statements in the
CONFIG.SYS. Third, we delete the VDU container file.  Fourth, we restart the
computer to initiate the changes made to the CONFIG.SYS.

Note:  Deleting a VDU deletes all of the data stored in the VDU.  Be sure to
       make a backup copy of any of the data you do not want to delete
       permanently before proceeding.

 Shut Down the DCF2

 A VDU cannot be deleted while the DCF2 control processes are running.  If you
 try to, you get an error message that the drive is in use by another process.

 To shut down the DCF2, first change to the DCF2 program directory.  Then, use
 the either the DCF2 /A:SHUTDOWN or DCF2 /- command to stop the DCF2 control
 processes.

     DCF2 /A:SHUTDOWN

 Remove the VDU Drive Letter

 To remove the VDU drive letter, we edit the DCF/2 statements in the
 CONFIG.SYS.  First, we look for the /u: parameter following the DCF2PDD.SYS
 and reduce the number by 1.

 Next remove from the CONFIG.SYS the SET statement which points to our last
 drive letter:

     SET DCF2_VDU_G=D:\DCF2\DCF2_G.VDU

 Finally, we save the changes to the CONFIG.SYS. and exit from the edit
 session.

 Delete the VDU Container File

 To protect you from inadvertantly deleting your VDU(s), we set the system
 attribute.  As a result, if you DELETE *.* in the DCF2 directory, OS/2 does
 not delete the VDU(s).

 For OS/2's DELETE command to access a VDU, we must first remove this
 attribute: The OS/2 command used to remove the system attribute is:

     ATTRIB *.VDU -S

 Now, we can use the DELETE command to delete the VDU container file.  In the
 case of the system described in the section on adding a VDU, the last VDU is
 G:.  The following command would delete the file:

     DELETE DCF2_G.VDU

 Restart the Computer

 As always, changes to the CONFIG.SYS are only initialized after the computer
 is restarted.


ΓòÉΓòÉΓòÉ 7.2.3. How to Remove the DCF/2 ΓòÉΓòÉΓòÉ

If you want to remove the DCF/2 from your computer completely, the procedure is
much the same as that for deleting a VDU (as described in the preceding
section).  Instead of deleting a single VDU, you delete all VDUs and the DCF/2
programs and DCF2 program directory as well.  Instead of changing DCF/2
statements in the CONFIG.SYS, you remove all statements.

Note:  Deleting a VDU deletes all of the data stored in the VDU.  Be sure to
       make a backup copy of any of the data you do not want to delete
       permanently before proceeding.

 The four steps in the procedure are:  First to shut down the DCF2 control
 processes; second to delete the VDUs, DCF/2 programs and directory or
 directories; third to remove all of the DCF2 statements from the CONFIG.SYS;
 and fourth, to restart the computer system.

 Shut Down the DCF2

 VDUs cannot be deleted while the DCF2 control processes are running. So, the
 first step is the shut down the DCF2.

 To shut down the DCF2, first change to the DCF2 program directory.  Then, use
 the either the DCF2 /A:SHUTDOWN or DCF2 /- command to stop the DCF2 control
 processes.

     DCF2 /A:SHUTDOWN

 Delete DCF/2 Files

 Your VDUs may or may not be in the same DCF2 directory as are the DCF/2
 program files.  Before you can DELETE them, you must remove the OS/2 system
 attribute from the VDU(s), so that the OS/2 DELETE command will be able to
 access the files.

 For each host on which you placed one or more VDUs, change to the DCF2
 directory, and use the following OS/2 command to remove the system attribute
 from the VDU(s):

     ATTRIB *.VDU -S

 Now, use the DELETE command to delete the VDU container file(s) and DCF/2
 programs:

     DELETE *.*

 Finally, remove the DCF2 directory or directories:

     rd DCF2

 Remove the DCF/2 Statements

 Next, edit the CONFIG.SYS file.  All of the DCF/2 statements added to your
 CONFIG.SYS file are delimited by lines and marked with the date-time stamp for
 the change.  The statements include:

     o Two DEVICE statements (DCF2PDD.SYS and DCF2CDE.SYS)
     o One SET statement for each VDU
     o One CALL statement at the end of your CONFIG.SYS

 Delete these, save the changes to the CONFIG.SYS and exit the edit session.

 Hint:  If you have not made any changes to your CONFIG.SYS since installing
 the DCF/2, you can avoid having to edit the file manually.  Instead, copy
 CONFIG.!D! to CONFIG.SYS to restore the file as it existed just prior to
 installing the DCF/2.

 Restart the Computer

 The last step is to initialize the changes made to the CONFIG.SYS by rebooting
 or restarting the computer.


ΓòÉΓòÉΓòÉ 7.3. Ancillary Control Process (DCF2ACP.EXE) ΓòÉΓòÉΓòÉ

Just as a physical disk unit has a controller, so do our virtual disks.  The
"ACP" is the virtual disk's controller.  When the DCF2ACP is stopped, it is
analogous to pulling your physical disk's controller out of your system box.
You cannot access compressed data on a VDU if the DCF2ACP is not running.

Any DCF/2 Ancillary Control Process error conditions are reported in the
DCF2ACP.LOG file created in the root of your OS/2 boot drive.  If you
experience a problem, you may want to enable DCF2ACP logging and debugging to a
greater degree.  You can do so by removing the REM >> from the DCF2ACP logging
statement in your CONFIG.SYS and rebooting.

     SET DCF2_ACP_LOGNG=3
     SET DCF2_ACP_DEBUG=3

 The DCF/2 takes advantage of the sophisticated caching mechanisms available
 with the High Performance File System.  Anytime you write data to cache blocks
 -- whether using the DCF/2 of not -- there is the risk that it will be lost
 should the power to the machine be interrupted.  We feel the performance
 benefit caching provides far out weighs this risk.  But, just in case you do
 not share these sentiments, enter the following SET statement in your
 CONFIG.SYS:

     SET DCF2_ACP_MISSION_CRITICAL=1


ΓòÉΓòÉΓòÉ 7.4. VDU Control Process (DCF2VCP.EXE) ΓòÉΓòÉΓòÉ

The DCF2VCP manages the virtual disk units you create using the controller
(DCF2ACP).  During system startup, the DCF2VCP initializes your VDUs and
launches the DCF2ACP and Space Manager.

Any DCF/2 VDU Control Process error conditions are reported in the DCF2VCP.LOG
file created in the root of your OS/2 boot drive.  If you experience a problem
during system startup, you may want to enable DCF2VCP logging to a greater
degree.  You can do so by removing the REM >> from the DCF2VCP logging
statement in your CONFIG.SYS and reboot.  Or you can issue the following SET
command:

     SET DCF2_VCP_LOGNG=3
     SET DCF2_VCP_DEBUG=3


ΓòÉΓòÉΓòÉ 7.5. LED Monitors (DCF2MON.EXE) ΓòÉΓòÉΓòÉ

The monitors are LED icons -- one for each VDU you create.  They flash to
indicate drive activity.  Monitor LEDs flash red for write and blue for read
operations.  They flash green during compression and yellow during
decompression.

If you need to create a VDU LED manually, do the following:

      1. Use the drives icon to open the DCF2 program directory.
      2. Locate the DCF2MON.EXE icon in the DCF2 program directory.
      3. Drag the icon to your Startup folder.  (Control+Right Mouse Button)
      4. Open the settings notebook for the icon.
      5. Go to the parameters box on the program setting page.
      6. Enter /l:X, where X is the VDU drive letter.
      7. Close the settings notebook.
      8. Double click on the VDU LED to put it on your desktop.

 You can move the icon to a specific location on your desktop and save that
 location so that when you restart your system, the icon retains its location.
 To do so, drag the icon to the desired location.  Double click on the icon to
 close it.  Reboot your system.  The icon's location coordinates are now saved.

 You can make your VDU LEDs larger.  Click the minimize button on the LED.  The
 icon disappears from the desktop and reappears in your minimized window viewer
 -- bigger.

 Hint   If you double click on an LED icon in your Startup Folder and the
 Window List pops up, look for the LED icon in your Minimized Window Viewer.

 The following are optional parameters for DCF2MON.EXE. and are specified in
 the parameters box in the LED icon's settings notebook on the program settings
 page.

     Parameter                            Function
     /l:X                                 VDU Drive letter for this LED icon.
     /x: followed by a decimal value.     Designates the x coordinate location
                                          of the LED icon on your Desktop.
     /y: followed by a decimal value.     Designates the y coordinate location
                                          of the LED icon on your Desktop.
     /t: followed by time in seconds.     Establishes the refresh frequency for
                                          the LED icon.  Increase this if you
                                          feel the monitor refreshes are
                                          loading your system.  (Applies to
                                          certain video adaptors.)
     /w                                   Adds the monitor processes to the
                                          Window List


ΓòÉΓòÉΓòÉ 7.6. Shut Down Program ΓòÉΓòÉΓòÉ

As of Version 1.2, the DCF/2 shut down in completely integrated with OS/2's
standard "right mouse button" shut down.  If you have a DCF/2 System Shutdown
icon on your desktop, please delete it.

Whenever possible, use shut down before turning your computer off.  By doing
so, you insure that all of your VDUs are shut down properly and that the shut
down process continues through the final Control-Alt-Delete box.  You also
bypass the CHKSDK /F (the DCF/2 automatically performs) on all drives found
improperly shut down the next time your system boots OS/2.


ΓòÉΓòÉΓòÉ 7.7. Optimize Utility ΓòÉΓòÉΓòÉ

The Optimize Utility is not one you will run on a daily basis or even a weekly
basis unless you feel it necessary to do so.

Space occupied by files you have deleted from your VDU is only recovered by
running the Optimize Utility (DCF2PAKR).  The utility has two parts.  The first
(purge) concerns the deleted space on the VDU.  It is necessary to run this
part of the utility only if you have deleted a significant number of files from
your VDU.  The second part (optimize) recompresses the data stored on the VDU
to its maximum compression.  As result, the average compression ratio for the
data stored in the VDU increases.

The purge function is going to "touch" every byte of unused space on your VDU.
If a problem occurs, run CHKDSK /F:3 on the VDU at your earliest convenience.
Be aware, CHKDSK /F:3 can take a very long time.  This is because it thoroughly
checks all unused space on the disk.  It is best to begin a CHKDSK /F:3 at the
end of your work day.

Note:  Your VDU(s) and the programs and data on them are not available to you
       during the optimize process.  The length of time required to optimize or
       recompact a VDU will vary with speed of your computer processor and the
       size of the VDU. Refer to the tables below to determine how much time to
       allow to recompact the VDU(s) on your computer system.

 To optimize a 200 MB Virtual Disk Unit with 190 MB in use on a 586/60 class
 machine will require 20-25 minutes.  Since not all VDUs are created and
 optimized on a Pentium, the following table describes the estimated time
 required to optimize selected-size VDUs on a 486/66 class machine:


  Estimated Time Required to Optimize Your VDU

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéVDU Size    ΓöéEstimated Time to Complete            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé100 MB      Γöé15 minutes                            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé200 MB      Γöé30 minutes                            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé500 MB      Γöé75 minutes                            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé1 GB        Γöé2 1/2 to 3 hours                      Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 In order to estimate the length of time recompacting the VDU(s) will require
 on your system, refer to the following table.


  1K Chunks Optimized per Minute by Machine Class

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéClass of Machine      ΓöéMinutes per 1K Chunks                 Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé486/50 - 586/60       Γöé1 minute per 1K chunks                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé486/25 - 486/50       Γöé3 minutes per 1K chunks               Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé386/33                Γöé5 minutes per 1K chunks               Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé386/10 - 386/25       ΓöéUp to 10 minutes per 1K chunks        Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 Optimizing a VDU involves four steps:  Purging the VDU(s), stopping the
 DCF2ACP, optimizing the VDU(s) and then restarting the DCF2ACP.

 Purging VDUs

 Purging removes deleted space from VDU(s) -- it does not remove your data.
 You purge a VDU prior to optimizing it only if you have deleted a significan
 number of files from the VDU.

 To purge VDU E: you use the following command in which the /P parameter means
 PURGE and /V: is following by the drive letter of the target VDU:

     DCF2PAKR /P /V:E

 Stopping the DCF/2 in Preparation to Optimize VDUs

 Before you can proceed to OPTIMIZE your VDUs, you must first stop the DCF2ACP.
 To do so, use the following command:

     DCF2 /A:SHUTDOWN

 Remember, your VDUs and the data on them will not be available until you
 restart the DCF2ACP.

 Optimizing VDUs

 The OPTIMIZE process will recompress each chunk of compressed data stored in
 the VDU to its maximum compression.

 To optimize VDU E: you use the following command in which the /O parameter
 means OPTIMIZE and /V: is following by the drive letter of the target VDU:

     DCF2PAKR /O /V:E

 Starting the DCF/2

  Once the OPTIMIZE program completes, you need to restart the DCF/2 control
 processes in order to access the data on you VDUs.  From the DCF2 program
 directory, execute the DCF2 control program command:

     DCF2 /A:STARTUP

 Converting DCF/2 Version 1.1a to Version 1.2 Format

 Users with existing VDUs formatted under DCF/2 Version 1.1a should refer to
 the appropriate appendix for the procedure to follow in order to convert VDUs
 created using version 1.1a to the format used in version 1.2.


ΓòÉΓòÉΓòÉ 7.8. DCAT (Disk Compression Analysis Tool) ΓòÉΓòÉΓòÉ

The DCF/2 comes with a powerful and easy-to-use utility which allows you to
analyze the data on a selected physical or logical drive in terms of the
average compression ratio and the amount of space recoverable by storing that
data on a DCF/2 virtual disk.

The DCF/2 installation program placed a DCAT icon on your desktop.  The DCAT or
Disk Compression Analysis Tool is an interactive, OS/2 Presentation Manager
application, with full online help (F1, or HELP button).  To run the DCAT,
change to the DCF2 program directory and type:  DCAT.


ΓòÉΓòÉΓòÉ 7.9. Moving Files from Physical to Virtual Space ΓòÉΓòÉΓòÉ

You can use any of your existing DOS, Windows, or OS/2 program utilities to
move, copy, delete, and maintain your DCF/2 VDU files.  NOTE:  Some
applications (e.g., FaxWorks for OS/2) load device drivers from DEVICE
statements in your CONFIG.SYS file.  If the PATH for the device driver points
to a virtual disk unit that is not yet available, OS/2 will report the DEVICE
not found.  For these applications, move the applications to a virtual disk
unit, but leave the application's device drivers on the physical disk unit in
an identical subdirectory.

Using XCOPY and DELETE

When using XCOPY to copy files into a VDU, it is recommended that you include
the '/f' and '/e' command line switches to insure that the existing file
extended attributes are copied from the physical disk unit.  See the OS/2
online help for XCOPY for additional switches.

Using the Drives Icon

The OS/2 DRIVES icon provides you with a powerful Presentation Manager utility
which not only copies and moves your files between physical and compressed
virtual disk storage, it simultaneously updates your DESKTOP objects so that
they reflect the necessary drive letter changes, too!

Be aware, when moving program objects, that there may be LIBPATH, PATH, and
DPATH references to those program objects which may not be updated.

If you have very little physical space available on the host and use the drives
icon, be careful.  The drives icon move seems to move files in large chunks,
first copying and then deleting them from their original location.  This can
cause you to run out of physical space on the host drive and may cause OS/2 to
trap.  Go slowly.

Hint  :  Including applications stored on a VDU in the LIBPATH statement in
your CONFIG.SYS is somewhat problematic.  If the AutoCheck function hasn't
completed and your VDUs are not yet available to OS/2, it can cause the system
to lock up.  The workaround is to create the identical subdirectory on a
physical disk unit and move all of the program in questions DLLs to the
subdirectory on the PDU.  Then change the LIBPATH to point to the subdirectory
on the PDU.


ΓòÉΓòÉΓòÉ 8. VDU Maintenance ΓòÉΓòÉΓòÉ

Because of the auto-checking built into the DCF/2 startup process, you won't
normally need to spend a great deal of your time checking your physical and
virtual space.

The following topics are covered in this section:

     o Checking Physical Space
     o Checking Virtual Space


ΓòÉΓòÉΓòÉ 8.1. Checking Physical Space ΓòÉΓòÉΓòÉ

THE CARDINAL RULE FOR VDU MAINTENANCE IS: ALWAYS RUN CHKDSK ON THE PHYSICAL
DRIVE FIRST.  If you suspect that the VDU's physical or host drive is
corrupted, you MUST run CHKDSK (FAT) or CHKDSK /F (HPFS) on the physical drive
to prevent damaging the VDU.

You will use CHKDSK on FAT-based physical disk units and CHKDSK /F on
HPFS-based physical disk units.  If you are unfamiliar with this program,
please refer to OS/2's online help.


ΓòÉΓòÉΓòÉ 8.2. Checking Virtual Space ΓòÉΓòÉΓòÉ

Because a VDU looks physical to OS/2, it requires no special utilities beyond
those supplied with OS/2.  In this case, that is the CHKDSK program.  The
program will correct any space allocation errors and remove any corrupted files
in the VDU, placing them in the FOUND directory as ".CHK" files.

Run CHKDSK /F on your VDUs only after you have CHKDSK'ed the physical or host
drive or are absolutely certain that the host drive is "clean."  If you are
unfamiliar with this program, please refer to OS/2's online help.

The DCF2INFO file for each VDU reports both the current compression ratio for
the VDU and the estimated compression ratio after the next recompaction or
optimize.  As you use your VDUs, you will notice the average compression ratio
for the data stored on a VDU begin to drop.

Once a week to once a month -- or as you feel it necessary -- run the DCF2PAKR
program on each of your VDUs to purge them of deleted space and optimize them.
During this process each chunk of data stored in the VDU is recompressed.
Generally, you will recover about 10% of the space in use on the drive.

The process involves four steps:  The first step zeros out deleted and lost
space on the drive.  We call this "purging."  It does not purge data from your
VDU -- only free space.  The DCF2 must be running during the purge function.
Once the purge function is complete, the second step is to stop the DCF2. The
third step is to optimize the drive.  This decompresses and recompresses each
chunk of data on your VDU.  The fourth step is to restart the DCF2.

      1. Purge your VDU of deleted space using the DCF2PAKR command:  DCF2PAKR
         /p /v:x
      2. Stop the DCF2 using the DCF2 command:  DCF2 /A:Shutdown
      3. Optimize your VDU using the DCF2PAKR command:  DCF2PAKR /o /v:x
      4. Restart the DCF2 using the DCF2 command:  DCF2 /A:Startup

 The commands are executed from an OS/2 window or full screen, in the DCF2
 program directory.  In the above example, the DCF2PAKR command options are:
 /p (purge), /v:x (the VDU drive letter to be purged, e.g. VDU X) and /o
 (optimize).

 You can create a batch file to purge and optimize your VDU(s) and launch it
 from OS/2's ALARMS applet or from a commercial package like Sundial's RELISH
 for OS/2.  Just remember to purge all VDUs before you shut down the DCF2.
 Then, optimize all VDUs before starting the DCF2 again.

 For additional information please refer to the section in the User Reference
 on the "Optimize Utility."


ΓòÉΓòÉΓòÉ 9. Troubleshooting ΓòÉΓòÉΓòÉ

The following sections describe the most common problems and what to do.  The
first rule is:  Don't panic.  Using the tools you have on hand, you can recover
from almost any situation.  The topics covered include:

     o Logfiles
     o Installation Fails
     o VDU Drive Letter Incorrect
     o VDU Does Not Autoformat
     o Long Low Beep-Beep During Initialization
     o System Hangs
     o Drive Inconsistencies
     o Root Directory Not Found
     o VDU Appears to be Out of Space
     o DCF/2 Sings
     o Shut Down Doesn't Work
     o Miscellaneous
     o Contacting Technical Support


ΓòÉΓòÉΓòÉ 9.1. Logfiles ΓòÉΓòÉΓòÉ

The first place to look to diagnose the cause of a suspected problem is the
logfiles, DCF2ACP.LOG and DCF2VCP.LOG in the root of your boot drive. These
logfiles are created automatically by the DCF/2.  If you delete them -- which
you will want to do from time to time -- they will be recreated the next time
you startup the DCF/2.

In some cases, you may need more detailed log information.  When you installed
the DCF/2, it installed in your CONFIG.SYS file logging and  debug statements
for both the DCF2ACP and DCF2VCP.  To enable logging permanently, you can
remove the REM from in front of eitiher or both of the statement(s).

     SET DCF2_ACP_LOGNG=3
     SET DCF2_ACP_DEBUG=3

 Before calling for technical support, please have a copy of the DCF2ACP.LOG
 and the DCF2VCP.LOG available.  You may be asked to fax a copy of it to us. If
 the file covers several days, it will not be necessary to send all of the
 pages -- usually the last few entries will be all that are necessary.


ΓòÉΓòÉΓòÉ 9.2. Installation Fails ΓòÉΓòÉΓòÉ

If you installed the DCF/2 from a temporary directory on your hard drive, make
sure the name of the temporary directory is not "DCF2."  If it is, make a new
temporary directory using some other name (e.g.,D:\tmp), copy the files to the
new directory and delete the old one.  Run the DCF/2 installation program from
the new temporary directory.


ΓòÉΓòÉΓòÉ 9.3. VDU Drive Letter Incorrect ΓòÉΓòÉΓòÉ

The first VDU will take the first physical drive letter available on your
system.  Remember that network drives are logical not physical.  If network
drives are enabled when the DCF/2 installation program is run, the first VDU
will take an incorrect drive letter.

For example, say your system has a physical drive C:, logical D:, network drive
E: and F:.  The DCF/2 would assume that the first available drive letter is G:
rather than E:.  If you have LAN software running, you need to logoff prior to
running the DCF/2 installation program.

If you have completed the installation process and only later realized that you
had not logged off of your network, you can make the necessary changes to
correct the drive letter manually.  Do the following:

      1. Edit the VDU's SET statement in your CONFIG.SYS file to reflect the
         correct drive letter if it does not.

      2. Change to the DCF2 program directory.  Remove the system attribute
         from the VDU file:

        ATTRIB *.VDU -S

      3. Rename the VDU file to match that of its environment statement in the
         CONFIG.SYS

      4. Reboot the system.

 Return to the example of the system with physical C: and logical D:, on which
 the first VDU should be E: and the second F: -- but, because we hadn't logged
 off of the network before running the DCF/2 installation program, the first
 VDU took drive letter G: and the second H:.

 The incorrect statements inserted in the CONFIG.SYS look like this:

     DEVICE=C:\DCF2\DCF2PDD.SYS /u:2
     SET DCF2_VDU_G=C:\DCF2\DCF2_G.VDU
     SET DCF2_VDU_H=D:\DCF2\DCF2_H.VDU

 First, we edit each SET statement in the CONFIG.SYS to reflect the correct
 drive letters, E: and F: and save the changes.  The corrected statements look
 will this:

     SET DCF2_VDU_E=C:\DCF2\DCF2_E.VDU
     SET DCF2_VDU_F=D:\DCF2\DCF2_F.VDU

 Next, we change to the DCF2 program directory on drive C: and remove the
 system attribute from the VDU:

                                 ATTRIB *.VDU -S

 Now, we rename the file:

                           RENAME DCF2_G.VDU DCF2_E.VDU

 We repeat the above two steps for the second VDU -- changing to the DCF2
 directory on D:, removing the system attribute and renaming the file to be, in
 this case, DCF2_E.VDU.

 Finally, we reboot the system to initiate the changes we've made.


ΓòÉΓòÉΓòÉ 9.4. VDU Does Not Autoformat ΓòÉΓòÉΓòÉ

Each VDU must have an environment statement in the CONFIG.SYS file which
provides the full path for the VDU's container file.  If this statement is
missing or incorrect, the DCF/2 cannot find the file.

This situation is most likely to occur if you create additional VDUs after
having run the DCF/2 installation program and forget to either increment the u:
number following the DCF2PDD.SYS or to add an environment statement for the
VDU.  (Check, too, for typographical errors.)

Check to make sure that the environment statement does in fact exist and that
the drive association is correct, i.e., it points to a valid file.  You can do
this by looking at the statements the install program placed in your CONFIG.SYS
file, or you can use the following OS/2 command:  SET

In either case, your should find a statement that resembles the following for
each VDU:

     SET SET DCF2_VDU_X=[host drive letter]:\DCF2\DCF2_X.VDU

 In the above statement, X is the VDU's drive letter.

 Refer to the foregoing example, if you find you have made a mistake and need
 to correct the either the VDU's file name and/or environment statement(s).


ΓòÉΓòÉΓòÉ 9.5. Long Low Beep-Beep During Initialization ΓòÉΓòÉΓòÉ

The DCF2PDD.SYS places a lock on its shared memory.  This signal means that the
lock has failed.  Reports seem to indicate that OS/2's memory allocation during
system startup can be timing sensitive.

The solution is to either move the DCF/2's CALL= statement from the end of your
CONFIG.SYS file to your STARTUP.CMD, or to reduce the cache sizes for either or
both the HPFS cache and the FAT diskcache.

In some cases, the order in which various DEVICES load in the CONFIG.SYS can
affect OS/2's memory allocation during startup.  Since systems differ, you may
find it helpful to experiment with the order in which DEVICES load on your
system.


ΓòÉΓòÉΓòÉ 9.6. System Hangs ΓòÉΓòÉΓòÉ

If your system fails to startup correctly, i.e., it hangs before or during VDU
initialization, or as the workplace shell loads, do the following:

      1. Reboot the system.

      2. When you hear the first set of "bleep-bleeps," hold down the CONTROL
         key to launch an OS/2 command processor.

      3. Change to the DCF2 program directory.

      4. Use the DCF2PAKR to optimize and repair any VDU's in question.  Use
         the following command -- replacing the X with the drive letter of the
         VDU to be optimized:

        DCF2PAKR /O /V:X

      5. Repeat step 4. for each VDU.

      6. Type:  EXIT

 System startup will continue.  The VDUs should initialize and all should be
 back in order.

 If problems persist, check the DCF2ACP.LOG file in the root of your boot
 drive.


ΓòÉΓòÉΓòÉ 9.7. Drive Inconsistencies ΓòÉΓòÉΓòÉ

The prescribed remedy whenever you suspect a problem is to do the following:

      1. Run CHKDSK /F:2 on the physical host drive three times.  (You may need
         to do this from floppy.)
      2. Run CHKDSK /F:3 on the physical host drive at least one time.  (Twice,
         maybe.)
      3. Startup the DCF/2 and repeat steps 1. and 2. for each virtual disk
         unit.

 Because of the time involved, you may want to write a simple batch file, e.g.
 CHKVDU_M.CMD, that you can run at night.  It might look like the following:

          @echo off
          chkdsk m: /f
          chkdsk m: /f
          chkdsk m: /f
          chkdsk m: /f:3
          chkdsk m: /f:3
          exit


ΓòÉΓòÉΓòÉ 9.8. Root Directory Not Found ΓòÉΓòÉΓòÉ

Do not panic.  This occurs infrequently -- generally after a severe system
crash.

Allow CHKDSK /F to run and repair any damage.  In some cases, this has been
known to take several hours.  Because of the "iterative" nature of the program,
you should then run it again and again until it no longer reports errors.  You
may have some work to do to rename the FOUND* directories and CHECK files, but
your VDU will be intact.

In extreme cases, it may be necessary to restart or reboot your computer
system.  We have had instances where it looked as if a drive had been lost only
to restart the system and find it still there and intact.

Following the CHKDSKs, stop the DCF/2 control processes and run the DCF2PAKR /O
to recompress all of the data stored on the VDU.  Do not run the DCF2PAKR /P
option to purge the VDUs of empty space first.


ΓòÉΓòÉΓòÉ 9.9. VDU Appears to be Out of Space ΓòÉΓòÉΓòÉ

Virtual space is managed so that, when you do a directory of the VDU, what you
see correctly reflects the estimated amount of virtual space available. Each
VDU has a DCF2INFO.CMD file, which is adjusted dynamically based upon the
average compression ratio of the data in the VDU and the amount of physical
space available on its host drive.

Whenever an abnormal shut down occurs, the OS/2 CHKDSK /F program is
automatically run as the system boots OS/2.  It has been known to remove a
corrupted DCF2INFO.CMD file and place it in a FOUND directory.  The
DCF2INFO.CMD file may appear very large to OS/2.  The result is that your
system appears out of space.

If you suspect that CHKDSK has, in its infinite wisdom, placed a renamed copy
of your VDU's DCF2INFO.CMD space management file in one of these FOUND
directories, find it and delete it.


ΓòÉΓòÉΓòÉ 9.10. DCF/2 Sings ΓòÉΓòÉΓòÉ

The DCF/2 comes "audio-enabled."  The sounds mean different things.

Unlicensed Copy

If this copy of the DCF/2 is an unlicensed copy -- one not purchased -- it will
"sing".  This audible signal is our gentle reminder that this copy of the DCF/2
is unlicensed.

While we wish to give those who feel they need an opportunity to "try before
you buy," the opportunity to do so, the DCF/2 is neither "shareware" nor
"freeware" but licensed software.  To license it, one must purchase it.  See
the second page of the REMINDER.LOG generated in your in the root directory of
your boot drive for information on both temporarily disabling the sounds and
purchasing the DCF/2.

If your licensed copy of the DCF/2 continues to sing, we apologise. Please
contact technical support at your earliest convenience.

Beep-Beep at Startup

As the system starts up a series of beep-beeps signal that the keyboard is
enabled to capture a user entered SHIFT or CONTROL in order to abort or
interrupt the DCF/2 loading process.

These can be disabled using by adding the /q (must be in lowercase) parameter
to the CALL= statement in your CONFIG.SYS.  The line might look like the
following:

                       CALL=C:\DCF2\DCF2.EXE /A:STARTUP /q


ΓòÉΓòÉΓòÉ 9.11. Shut Down Doesn't Work ΓòÉΓòÉΓòÉ

If your system does not shut down through the final C-A-D box, check to see if
there are any *.new files in your OS2\DLL subdirectory.  If there are, you need
to rename them manually by doing the following:

      1. Reboot.
      2. Use the CONTROL key to interrupt the DCF/2 load and launch an OS/2
         command processor.
      3. Use the OS/2 copy command to rename the files:  Copy OS2\DLL\*.NEW
         OS2\DLL\*.DLL
      4. Delete the *.NEW files
      5. Continue system startup.  Type:  EXIT


ΓòÉΓòÉΓòÉ 9.12. Miscellaneous ΓòÉΓòÉΓòÉ

If you are running 4OS2, make sure you are running the most current version.
Older versions of 4OS2 have been known to produce strange messages.  Some users
have reported problems shutting down when using 4OS2.

If you find that your system is not shutting down correctly, check for any
"*.new" files in your OS2\DLL subdirectory and rename them *.DLL.  To do so by:

      1. Reboot.
      2. Use the CONTROL key to interrupt the DCF/2 load and launch an OS/2
         command processor.
      3. Use the OS/2 copy command to rename the files:  Copy OS2\DLL\*.NEW
         OS2\DLL\*.DLL
      4. Delete the *.NEW files
      5. Continue system startup; type:  EXIT


ΓòÉΓòÉΓòÉ 9.13. Contacting Technical Support ΓòÉΓòÉΓòÉ

Telephone technical support is available to registered users only.  Please have
your license number handy as well as a copy of the DCF2ACP.LOG file if
appropriate.  Telephone technical support is available Monday through Friday
and is reached by calling [phone] between 8 a.m. to 4 p.m Eastern Time.

Online technical support is available to both registered and unregistered users
through the Proportional Software OS2BBS CForum (OS2DCF2 via IBM TalkLink and
Advantis) and through the Proportional Software Vendor Forum on CompuServe (GO
OS2AVEN).


ΓòÉΓòÉΓòÉ 10. Glossary of Terms ΓòÉΓòÉΓòÉ

The glossary provides definitions for commonly used terms.

On-the-fly Data Compression

An on-the-fly data compression product creates a special file, which serves as
a container for compressed data.  When the an application requests data stored
in this way, the data is automatically compressed or decompressed "on-the-fly."
The user does not have to execute a command to "unzip" or "unpak" the data
requested.

Virtual Disk Unit or VDU

"Virtual Disk Unit" is the term we use to describe a DCF/2 compressed drive. It
looks like a "real" or "physical" drive to OS/2.

Target Drive

The target drive is the uncompressed drive to which the DCF/2 program files are
copied during the installation and from which OS/2 runs DCF/2 programs.

Host Drive

The host drive is the physical drive on which a DCF/2 "Virtual Disk Unit"  or
VDU resides.

DCF/2 Ancillary Control Process (DCF2ACP)

Just as a physical disk unit has a controller, so do our virtual disks. The
"ACP" is the virtual disk's controller.  When the DCF2ACP is stopped, it is
analogous to pulling your physical disk's controller out of your system box.
You cannot access compressed data on a VDU if the DCF2ACP is not running.

DCF/2 VDU Control Process (DCF2VCP)

The DCF2VCP manages the virtual disk units you create using the controller (DCF

DCF/2 Space Manager

One of the most important functions of the VDU Control Process (DCF2VCP) is spa
management for each of your VDUs.  DCF2VCP monitors the amount of space
available on each VDU's host drive and prevents the VDU from running out
physical space.

"Dirty"

The term "dirty" is used to describe the state of a physical or virtual drive w
the drive was shutdown by a means other than running the DCF/2 shutdown
program.

Typically, this happens if you switch off the computer without running shutdown
first.  It can happen as the result of a power failure or brownout.  It can
also happen as the result of an operating system trap or hang.

A drive that is "dirty" must be CHKDSKed prior to its being available for use.

DAT

The DAT is the Disk Allocation Table.  The DAT records the location of each
compressed or stored chunk, as well as free space available, on the VDU.

DTE

A DTE is an entry in the Disk Allocation Table.

FLE

An FLE is a Free List Entry.  Free list entries identify spaces in the VDU that
are available.  To check the number of FLEs on a VDU, use the X:D

When you run the DCF2PAKR /P operation, these are zeroed out.  The space is
then available to be recovered during the DCF2PAKR /O operation.

FLT

An FLT is a Free List Table or a table of FLEs for a VDU.  To check the number
of FLTs on a VDU, use the x:DCF2INFO command.  When you run the DCF2PAKR /O
utility, all but one of the FLTs is removed from the drive.


ΓòÉΓòÉΓòÉ 11. Appendix ΓòÉΓòÉΓòÉ

 The Appendix contains the following sections:

     o DCF/2 Command Reference
     o Converting Version 1.1a to Version 1.2
     o Tip & Techniques
     o Cache Considerations
     o 20 Questions About DCF/2
     o Trademarks, Copyrights, & Acknowledgements


ΓòÉΓòÉΓòÉ 11.1. DCF/2 Command Reference ΓòÉΓòÉΓòÉ

 Listed below are the commands available for the following DCF/2 programs:

     o Control Program (DCF2.EXE)
     o Optimize Utility (DCF2PAKR.EXE)
     o Monitor Program (MONITOR.EXE)


ΓòÉΓòÉΓòÉ 11.1.1. Control Program (DCF2.EXE) ΓòÉΓòÉΓòÉ


DCF2ControlProgramCommandLineParameters

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ΓöéCommand ΓöéParameter             ΓöéFunction                                Γöé
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ΓöéDCF2    Γöé/A:STARTUP            ΓöéStarts the DCF/2 Control Processes.     Γöé
Γöé        Γöé                      ΓöéMakes your VDUs available.              Γöé
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ΓöéDCF2    Γöé/+                    Γöé"Shorthand" method to start the DCF/2   Γöé
Γöé        Γöé                      ΓöéControl Processes.                      Γöé
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ΓöéDCF2    Γöé/A:STARTUP/q          ΓöéStarts the DCF/2 Control Processes      Γöé
Γöé        Γöé                      Γöéwithout beeps signaling "keyboard       Γöé
Γöé        Γöé                      Γöéenabled."                               Γöé
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ΓöéDCF2    Γöé/A:STARTUP/Q          ΓöéStarts the DCF/2 Control Processes      Γöé
Γöé        Γöé                      Γöéwithout beeps signaling "keyboard       Γöé
Γöé        Γöé                      Γöéenabled" and without writing the DCF/2  Γöé
Γöé        Γöé                      Γöéstartup messages to the screen.         Γöé
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ΓöéDCF2    Γöé/A:STARTUP/T:n        ΓöéStarts the DCF/2 Control Processes with Γöé
Γöé        Γöé                      Γöéa count-down of n seconds.  This is the Γöé
Γöé        Γöé                      Γöéinterval during which the keyboard is   Γöé
Γöé        Γöé                      Γöéenabled to accept a user entered SHIFT  Γöé
Γöé        Γöé                      Γöéor CONTROL key to to interrupt the      Γöé
Γöé        Γöé                      ΓöéDCF/2's load process.                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéDCF2    Γöé/A:Startup /D         ΓöéStarts the DCF/2 Control Processes and  Γöé
Γöé        Γöé                      Γöésays to delete the DCF2INFO.CMD at      Γöé
Γöé        Γöé                      Γöéstartup.  Use this option if you run    Γöé
Γöé        Γöé                      Γöévirus scanning software.  It will       Γöé
Γöé        Γöé                      Γöéeliminate uncecessary scanning time.    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéDCF2    Γöé/A:STATUS             ΓöéReports the Status of the DCF/2 Control Γöé
Γöé        Γöé                      ΓöéProcesses (currently running or         Γöé
Γöé        Γöé                      Γöécurrently not running).                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéDCF2    Γöé/A:SHUTDOWN           ΓöéStops the DCF2 Control Processes.  Your Γöé
Γöé        Γöé                      ΓöéVDUs are unavailable when you stop the  Γöé
Γöé        Γöé                      ΓöéDCF/2.  Use this command before you     Γöé
Γöé        Γöé                      ΓöéOPTIMIZE a VDU or if you need to delete Γöé
Γöé        Γöé                      Γöéa VDU.                                  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéDCF2    Γöé/-                    Γöé"Shorthand" method to stop the DCF/2    Γöé
Γöé        Γöé                      ΓöéControl Processes.                      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéDCF2    Γöé/V:CREATE /S: /F:     ΓöéCreates VDU of /S:[size in megabytes]   Γöé
Γöé        Γöé                      Γöéand /F:[file specification]  (The path  Γöé
Γöé        Γöé                      Γöéand filename for the VDU container      Γöé
Γöé        Γöé                      Γöéfile.)                                  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéDCF2    Γöé/R:X                  ΓöéRefreshes the DCF2INFO file for VDU "X."Γöé
Γöé        Γöé                      Γöé(Wait 15 seconds before typing the next Γöé
Γöé        Γöé                      ΓöéX:DCF2INFO.)                            Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


ΓòÉΓòÉΓòÉ 11.1.2. Optimize Utility (DCF2PAKR.EXE) ΓòÉΓòÉΓòÉ

Note:  If multiple VDUs are to be optimized, purge each VDU BEFORE issuing the
       command to optimize the VDUs.  The DCF2 must be running for the purge
       operation and must NOT be running for the recompression or optimize
       operation.


  DCF2PAKRCommandLineParameters

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéCommand   ΓöéParameter           ΓöéFunction                                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2PAKR  Γöé/P /V:X             ΓöéPurges VDU X, where "X" is the VDU's    Γöé
  Γöé          Γöé                    Γöédrive letter.  The DCF2 must be running.Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéDCF2PAKR  Γöé/O /V:X             ΓöéOptimizes VDU X, where "X" is the VDU's Γöé
  Γöé          Γöé                    Γöédrive letter.  Before "optimizing",     Γöé
  Γöé          Γöé                    Γöéshutdown the DCF2.                      Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


ΓòÉΓòÉΓòÉ 11.1.3. Monitor Program (MONITOR.EXE) ΓòÉΓòÉΓòÉ

The DCF2MON.EXE program includes optional parameters that can either be used
from an OS/2 command line or set using the VDU LED icon's Settings Notebook on
your Desktop.  These are:


MONITOR . EXECommandLineParameters

     Parameter                            Function
     /l:X                                 VDU Drive letter for this LED icon.
     /x: followed by a decimal value.     Designates the x coordinate location
                                          of the LED icon on your Desktop.
     /y: followed by a decimal value.     Designates the y coordinate location
                                          of the LED icon on your Desktop.
     /t: followed by time in seconds.     Establishes the refresh frequency for
                                          the LED icon.  Increase this if you
                                          feel the monitor refreshes are
                                          loading your system.  (Applies to
                                          certain video adaptors.)
     /w                                   Adds the monitor processes to the
                                          Window List.


ΓòÉΓòÉΓòÉ 11.2. Converting Version 1.1a to Version 1.2 ΓòÉΓòÉΓòÉ

Before you can use DCF/2 Version 1.1a VDU's with Version 1.2, you must follow
the procedure outlined below to "convert" them.

  1. Backup your 1.1a VDU before installing the DCF/2 1.2.

  2. Do not use the "Update/Register" option on the installation menu.  Do a
     full install according to the following steps:

     a. REM out all DCF/2 1.1a statements in your CONFIG.SYS file.
     b. Rename any existing DCF/2 VDUs to names other than DCF2_X.VDU, (e.g.,
        DCF2_X.11A); so that the install program does not delete it.
     c. Reboot your computer system.
     d. Install the DCF/2 Version 1.2.
     e. Reboot your computer system -- the install program will do this for
        your.

  3. Let the DCF/2 startup normally.

  4. Go to an OS/2 command prompt and change to the DCF/2 program directory.

  5. Use a SET statement to point to your version 1.1a VDU:  SET
     DCF2_VDU_X=DCF2_X.11a.

  6. Stop the DCF/2 using the command, DCF2 /A:SHUTDOWN.

  7. Use the DCF2PAKR program to decompress and then recompress the data in the
     VDU: Type DCF2 /O /V:X, where "X" is the VDU's drive letter.

  8. Your Version 1.1a VDU is now reformatted for Version 1.2 usage.

 Note:  The conversion takes approximately 1 minute per 1K chunks of data.  Do
        not interrupt interrupt the DCF2PAKR program or the VDU will be lost.


ΓòÉΓòÉΓòÉ 11.3. Tip & Techniques ΓòÉΓòÉΓòÉ

The following Tips & Techniques for using the DCF/2 were contributed by people
who use the DCF/2.

     o Updating the HPFS.IFS on Your OS/2 Disk 1
     o Creating a Maintenance Partition
     o Loading Devices from the CONFIG.SYS
     o Using the DCF/2 on Laptops
     o Using the DCF/2 on Read/Write or Magneto Optical Drives
     o Using an Alternative Startup
     o Using the DCF/2 and Netware
     o Hints for Running Your Applications from a VDU


ΓòÉΓòÉΓòÉ 11.3.1. Updating the HPFS.IFS on Your OS/2 Disk 1 ΓòÉΓòÉΓòÉ

If you need to boot from the OS/2 install diskettes for a manual CHKDSK of the
physical drives, copy the HPFS.IFS from the DCF/2 distribution disk to your
OS/2 disk 1 before running CHKDSK.  You MUST run CHKDSK from diskette using the
same HPFS.IFS as you are running on your system.  Remember, that during the
DCF/2 installation, the install program may have updated your HPFS.IFS.  If the
date and time stamp of this file is later than that of the HPFS.IFS on your
OS/2 disk 1, replace the HPFS.IFS on your Disk 1.  The date and time of the
file rather than the size is the key.


ΓòÉΓòÉΓòÉ 11.3.2. Creating a Maintenance Partition ΓòÉΓòÉΓòÉ

While you may never need one, should "disaster strike" (DCF/2 or otherwise),
you won't regret time you spent creating a small -- 3MB, for example --
maintenance partition. Include on your maintenance partition a small editor
should you need it to edit your CONFIG.SYS.  Also include CHKDSK.COM, UHPFS.DLL
and HPFS.IFS (make sure these are the versions currently in use on your
system), so that CHKDSK exercises on the "normal" partition can be performed.

If you have access to CompuServe, you may want to download BOOTOS.ZIP from
OS2USER, Library 17 (also EWS).  The file is intended for those in need of a
bit of assistance when creating a maintenance partition.


ΓòÉΓòÉΓòÉ 11.3.3. Loading Devices from the CONFIG.SYS ΓòÉΓòÉΓòÉ

Device drivers which are loaded during the processing of the CONFIG.SYS prior
to the DCF2PDD.SYS, should not be stored on a VDU.


ΓòÉΓòÉΓòÉ 11.3.4. Using the DCF/2 on Laptops ΓòÉΓòÉΓòÉ

In the following example, we describe a laptop system with a single hard drive
having one primary and one logical partition.  When docked, the system also has
a CD-ROM device.

The user wants to create 2 VDUs using the DCF/2.  The VDUs need to retain the
same drive letters -- regardless of whether the system is docked or portable.

The solution is the create an additional "dummy" VDU to hold the place of the
CD-ROM when portable.  The procedure is as follows:

     o If installing the DCF/2 for the first time, use the DCF/2 installation
       program to create a total of 3 VDUs -- two "real" compressed drives and
       one to serve as a placeholder for the CD-ROM.  The statements in the
       CONFIG.SYS look like this:

        DEVICE=C:\DCF2\DCF2PDD.SYS /U:3
        DEVICE=C:\DCF2\DCF2CDE.SYS
        SET DCF2_VDU_E=C:\DCF2\DCF2_E.VDU
        SET DCF2_VDU_F=C:\DCF2\DCF2_F.VDU
        SET DCF2_VDU_G=D:\DCF2\DCF2_G.VDU

     o If the DCF/2 is already installed (and the installation was run which
       the system was in the docking station), use the DCF2 V:CREATE command to
       create the "dummy" VDU.  The command syntax is:

        DCF2 /V:CREATE /S:[size in megabytes] /F:[full file specification]

     o To create a VDU of 1 MegaByte residing on "host" drive C:, the command
       would be:

        DCF2 /V:CREATE /S:1 /F:C:\DCF2\DCF2_E.VDU

     o When docked, the real VDUs will be F: and G:  There will also be a third
       VDU, drive H:  The path for this VDU should point to the "dummy" VDU.
       So that it does so, add the following SET statement to the CONFIG.SYS:

        SET DCF2_VDU_H=C:\DCF2\DCF2_E.VDU

     o Once the computer system is rebooted, the changes to the CONFIG.SYS file
       will be in effect and any unformatted.

     o When docked, the SET DCF2_VDU_E statement is ignored, the CD-ROM is E:.
       The user's real VDUs are F: and G: both when the system is in the
       docking station and when it is running portable.


ΓòÉΓòÉΓòÉ 11.3.5. Using the DCF/2 on Read/Write or Magneto Optical Drives ΓòÉΓòÉΓòÉ

In the event of an improper shutdown (loss of power, trap, hang, etc.) for the
case in which the VDU host is an Read/Write or Magneto Optical, do the
following:

      1. Take the media out of the drive on startup.
      2. Let the DCF/2 AutoCheck run.
      3. From an OS/2 Command Processor, change to the DCF2 program directory
         and shutdown the DCF2ACP.  Use the command, DCF2 /- or DCF2
         /A:SHUTDOWN.
      4. Put the media in the drive and do CHKDSK /F on the physical media.
      5. From an OS/2 Command Processor, change to the DCF2 program directory
         and startup the DCF2ACP.  Use the command, DCF2 /+ or DCF2 /A:STARTUP.
      6. Let the DCF/2 AutoCheck run.


ΓòÉΓòÉΓòÉ 11.3.6. Using an Alternative Startup ΓòÉΓòÉΓòÉ

Use RESTART=EVERYTHING in your CONFIG.SYS.  If you don't want everything
restarted for some reason, use CTRL+SHIFT+F1 as soon as the desktop first
appears to stop everything (including the DCF/2) from restarting.  (You can let
go of the keys when all icons appear.)  This also suppresses the objects in the
startup folder from starting.

Create a .CMD file, which contains the DCF2 /A:Startup command.  Place a
program object pointing to the .CMD in your STARTUP folder.


ΓòÉΓòÉΓòÉ 11.3.7. Using the DCF/2 and Netware ΓòÉΓòÉΓòÉ

If your VDU host is a Netware file server volume, the following tips should be
helpful.

      1. Run your Netware login from the CONFIG.SYS using
         "CALL=x:\Netware\login.exe". Place this CALL statement AFTER the block
         of Netware statements and BEFORE the "CALL=x:\DCF2\DCF2.EXE
         /A:STARTUP."

      2. Shutdown the DCF/2 BEFORE logging out.  The login-logout process can
         be automated using a REXX command procedure like the one that follows.

      3. Network-based VDUs are not shareable by two or more workstations at
         the same time. They can be accessed serially.

      4. A Netware-based VDU is a good place to keep personal data, but not
         recommended for storing Netware login, logout and other utilities.

 Sample REXX Command to Synchronize Login and Logout

          /* Netware login / logout */
          PARSE UPPER SOURCE . . progName
          progName = FileSpec('Nane',progName)
          PARSE ARG args
          /* Shutdown DCF/2 in preparation for logout */
          'd:\dcf2\dcf2.exe /a:shutdown'
          SELECT
          WHEN progName = 'LOGIN.CMD' THEN
             'd:\netware\login.exe args
          WHEN progName = 'LOGOUT.CMD' THEN
             'd:\netware\logout.exe'
          OTHERWISE
             SAY 'Program name must be LOGIN.CMD or LOGOUT.CMD'
          END
          /* Startup DCF/2 now that drives have been remapped */
          'd:\dcf2\dcf2 /a:startup'
          EXIT

 For initial startup, use the CALL statement in the CONFIG.SYS.  Then use the
 above sample program or one like it for subsequent logins and logouts.  You
 can make two copies of the sample program -- name one LOGIN.CMD and the other
 LOGOUT.CMD. You may need to copy the login.exe and logout.exe programs to a
 local drive.


ΓòÉΓòÉΓòÉ 11.3.8. Hints for Running Your Applications from a VDU ΓòÉΓòÉΓòÉ

Each application you run has a personality and quirks all its own.  We have
tested a wide variety of DOS, Windows and OS/2 applications.  For most of them,
the transition from physical to virtual is effortless.  They run from a virtual
drive just as they did from a physical one.

The following is a collection of hints contributed by DCF/2 users, based on
their experiences with some of the more finicky applications.

AmiPro 3.0a

AmiPro style sheets seem to want to load from a physical disk.  Not allowing
them to do so can result in a SYS3175 error.  Workaround:  Move all of AmiPro
to the VDU, but make sure that the style sheet directory is on a physical disk.
Then modify AMIUSER3.INI (use AmiPro's INIEDIT.EXE), so that the INI entry for
the style sheet directory points to the right place.

FaxWorks

The FaxWorks device driver loads before the DCF/2 starts up.  As a result, if
it is on a VDU, the device is not found.  Workaround:  Load FaxWorks FMD.SYS
from a physical drive.

Communications Manager/2

If Communications Manager/2 (and any number of other programs which add
statements to your CONFIG.SYS) is installed after the DCF/2, edit your
CONFIG.SYS so that the last statement in the file is the CALL=x:\DCF2\DCF2.EXE
/A:STARTUP.

In the case of Communications Manager/2, this will preclude its startup process
from interferring with that of your VDUs.


ΓòÉΓòÉΓòÉ 11.4. Cache Considerations ΓòÉΓòÉΓòÉ

Select from the tables below based upon whether your system is HPFS-only,
FAT-only, Both with HPFS Active and FAT Passive or Both with HPFS Passive and
FAT Active. For our purposes, "active" and "passive" are descriptors for the
way a partition is used.  If it is seldom used, consider it "passive."  If a
lot of disk intensive I/O occurs on the partition, consider it "active."


Case 1:  HPFS Partitions Only

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéRAM   ΓöéCACHE ΓöéLAZY      ΓöéMAXAGE  ΓöéDISKIDLE  ΓöéBUFFERIDLEΓöéOther               Γöé
Γöé      Γöé      ΓöéWRITES    Γöé        Γöé          Γöé          Γöé                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé16MB  Γöé2048  Γöé/LAZY:on  Γöé40000   Γöé30000     Γöé20000     ΓöéREM out DISKCACHE   Γöé
Γöé      Γöé      Γöé          Γöé        Γöé          Γöé          Γöéstatement           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé12MB  Γöé1536  ΓöéSame      ΓöéSame    ΓöéSame      ΓöéSame      ΓöéSame                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé8MB   Γöé1024  ΓöéSame      ΓöéSame    ΓöéSame      ΓöéSame      ΓöéSame                Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


Case 2:  FAT Partitions Only

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéRAM   ΓöéCACHE ΓöéLAZY      ΓöéOther                                           Γöé
Γöé      Γöé      ΓöéWRITES    Γöé                                                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé16MB  Γöé2048  Γöé/LW       ΓöéREM out the HPFS.IFS statement                  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé12MB  Γöé1536  ΓöéSame      ΓöéSame                                            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé8MB   Γöé1024  ΓöéSame      ΓöéSame                                            Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


Case 3:  HPFS and FAT with HPFS Active

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéRAM   ΓöéCACHE ΓöéLAZY      ΓöéMAXAGE  ΓöéDISKIDLE  ΓöéBUFFERIDLEΓöéDISKCACHE           Γöé
Γöé      Γöé      ΓöéWRITES    Γöé        Γöé          Γöé          Γöé                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé16MB  Γöé2048  Γöé/LAZY:on  Γöé40000   Γöé30000     Γöé20000     Γöé512-1024            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé12MB  Γöé1536  ΓöéSame      ΓöéSame    ΓöéSame      ΓöéSame      Γöé256-512             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé8MB   Γöé1024  ΓöéSame      ΓöéSame    ΓöéSame      ΓöéSame      Γöé128-256             Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


Case 4:  HPFS and FAT with FAT Active

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéRAM   ΓöéCACHE ΓöéHPFS LAZY ΓöéMAXAGE  ΓöéDISKIDLE  ΓöéBUFFERIDLEΓöéDISKCACHE ΓöéFAT LAZY  Γöé
Γöé      Γöé      ΓöéWRITES    Γöé        Γöé          Γöé          Γöé          ΓöéWRITES    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé16MB  Γöé1024  ΓöéN/A       Γöé40000   Γöé30000     Γöé20000     Γöé2048      Γöé/LW       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé12MB  Γöé768   ΓöéSame      ΓöéSame    ΓöéSame      ΓöéSame      Γöé1536      ΓöéSame      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé8MB   Γöé512   ΓöéSame      ΓöéSame    ΓöéSame      ΓöéSame      Γöé1024      ΓöéSame      Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Based upon the file system and cache tuning testing, the following are true:

     o The HPFS actually requires 128 to 130K of committed memory -- as opposed
       to the widely perceived 512K.  As cache size increases to 2MB (2048),
       this requirement increases as well, up to a maximum of about 240K.

     o The optimal cache size seems to be 1536.

     o When comparing the relative merits of the HPFS versus FAT, consider the
       following: On partitions of identical size, the HPFS gives you about 15%
       more space and performance is about 28% better!

     o Instead of continuing to increase performance, a DISKCACHE value in
       excess of 2048 seems to degrade performance rather than improve it.


ΓòÉΓòÉΓòÉ 11.5. 20 Questions About DCF/2 ΓòÉΓòÉΓòÉ

1.) Can I compress HPFS partitions using the DCF/2?

Yes, but you need to be running OS/2 2.11 (OS/2 2.1 plus the Service Pak) to do
so.

2.)  How does the DCF/2 differ from Stacker for OS/2 and DOS?

     o The DCF/2 allows the user to compress files stored on either FAT- or
       HPFS-formatted partitions.
     o The DCF/2 was designed for a multitasking operating system, OS/2 2.x --
       not "ported" from a single tasking operating system, DOS.
     o DCF/2 compressed drives can "reside" on any device supported by OS/2 --
       be they FAT- or HPFS-formatted, removable or network devices.
     o Compressed drives grow dynamically [--] the user doesn't have to
       pre-allocate a big chunk of space for the compressed drive.
     o DCF/2 is installed from OS/2 [--] not DOS.
     o All utilities are run from OS/2 [--] not DOS.

 3.)  What does "on-the-fly" mean?

 On-the-fly compression products like the DCF/2 create a special file, which
 serves as a container for compressed data.  When an application request data
 stored in this way, the data is automatically compressed or decompressed
 "on-the-fly."  The user does not issue a command to "unzip" or "unpak" the
 files he wants uncompressed.

 4.)  What is a VDU?

 VDU stands for Virtual Disk Unit.  It is the term used to describe the
 architecture of the DCF/2's compressed drive. Like a physical disk unit,  it
 works with low level OS/2 utilities like FORMAT and CHKDSK. Like a logical
 disk unit (e.g., a network drive), it isn't something you can reach out and
 touch.

 5.)  I haven't installed OS/2 yet.  Which do I install first, OS/2 or the
 DCF/2?

 Install OS/2 first, then the DCF/2.

 6.)  I run dual boot.  Can I access the compressed drive when I boot native
 DOS?

 Use the DCF/2 only to compress files and data you don't need access to when
 you boot native DOS.  OS/2 must be running to access the compressed data.
 From DOS the VDU looks like a big file.  The DCF/2 does give the user a great
 deal of flexibility with regard to picking and choosing what to compress and
 what not to compress.

 7.)  Do I have to back everything off of my system and reformat my hard drive?

  No.  There is no need to back everything off of you drive or to reformat it
 before installing the DCF/2.

 8.)  Does the DCF/2 compress an entire drive automatically?

 No.  Once a VDU is created and formatted, it is empty until the user moves
 programs and data onto it using the tools and utilities he normally uses to
 moves files and directories on his system, i.e., xcopy and delete or the OS/2
 drives icon.  The VDU grows dynamically as data is moved onto it.

 9.)  Can I compress OS/2?

 It is not recommended with version 1.2.  You can compress WINOS2, EPM (the
 Enhanced Editor) and OS/2 reference files (.INF).  However, if OS/2 needs to
 be reinstalled or the user plans to beta test a new version of the operating
 system, he or she should concentrate on moving program and data files to the
 VDU and leave OS/2 the full amount of space its installation requires.

 10.)  I am running OS/2 1.3.  Can I use the DCF/2?

 No.  The DCF/2 doesn't support OS/2 1.3.  The DCF/2 requires OS/2 2.1 if your
 system is FAT formatted only, or OS/2 2.11 (OS/2 2.1 plus the service pak) if
 your system is either HPFS or a combination of FAT and HPFS.

 11.)  Can I compress floppies?

 Yes.

 12.)  Can I compress my magneto or read-write optical drive?

 Yes.

 13.)  Can I put VDUs on a network drive?

 Yes.

 14.)  Can I compress the OS/2 SWAPPER.DAT file?

 No, not with version 1.2.

 15.)  Does the DCF/2 "double" my drive?

 The compression ratio for a VDU will vary with the type and mix of data on the
 system.  Typical compression ratios range from 1.5 to 1 (pre-compressed files,
 e.g., games, zipfiles, etc.) to 5 to 1 (user files, e.g., Ami Pro, etc.).
 Shipped with the DCF/2 is the Disk Compression Analysis Tool or DCAT.  It is a
 simple utility program which allows the user to analyze the data on his or her
 system in terms of how much space could be recovered if it were stored on a
 compressed drive.

 16.)  Can I use the DCF/2 with OS/2 for Windows?

 Yes.

 17.)  Can I use the DCF/2 with the new OS/2 Performance Version?

 Yes.

 18.)  Does the DCF/2 support drive letter swapping so that after I compress
 everything on my D: drive, I still have only a D: drive?

 No.  Drive letter swapping is not supported in version 1.2.  The VDU takes the
 next available physical drive letter on the users system. For example, if the
 user's system has a C:, D: and E:, the first VDU will be drive letter F: and
 so on.

 19.)  Why are the VDUs always formatted using the HPFS?

 Because the HPFS is a much faster and efficient way to manage the data store
 on a computer system.  In addition, it allows the user to use longer, more
 descriptive file names than the traditional "Eight-Dot-Three" naming
 convention.  "Statements" to the effect that the HPFS requires half a megabyte
 of memory are completely wrong. Even with the maximum cache size allowed
 (2MB), the HPFS never uses more than about 230K of memory.

 20.) I am using DOS 6 with compression.  Does DCF/2 include a conversion
 utility?

 No.  The user has to "unstack" the compressed drive, install OS/2 (if not
 already installed), then install the DCF/2 and move the data to be compressed
 onto the VDU(s).


ΓòÉΓòÉΓòÉ 11.6. Trademarks, Copyrights and Acknowledgements ΓòÉΓòÉΓòÉ

Proportional Software Corportation (PSC) provides this publication "as is"
without warranty of any kind, either express or implied, including but not
limited to the implied warranties of merchantability or fitness for a
particular purpose.

This publication could contain technical inaccuracies or typpographical errors.
Changes are periodically made to the information herein and the changes will be
incorporated in new editions of the publication.  PSC may make improvements
and/or changes in the products and/or the programs described in this
publication at any time.

     o Trademarks and Copyrights
     o Acknowledgments


ΓòÉΓòÉΓòÉ 11.6.1. Trademarks and Copyrights ΓòÉΓòÉΓòÉ

DCF/2(tm) and Disk Compression Facility for OS/2(tm) are trademarks of
Proportional Software.

IBM(r) and OS/2(r) are registered trademarks and Presentation Manager(tm) is a
trademark of International Business Machines Corporation.  CompuServe(r) is a
registered trademark of CompuServe Incorporated.  Relish for OS/2 Presentation
Manager(tm) is a trademark of Sundial Systems Corporation.  Lotus (r), AmiPro
for OS/2(r), 1-2-3 for OS/2(r), and Freelance Graphics(r) are registered
trademarks of Lotus Development Corporation.  FaxWorks(tm) is a trademark of
SofNet, Inc.

All other referenced products are trademarks or registered trademarks of their
respective manufacturers.

OS/2 files are being provided on behalf of IBM for maintenance purposes only
and the rights and licenses to these files are governed by the terms and
conditions of the user's OS/2 product license.

Copyright June 1994,  Proportional Software Corporation, 1717 Linden Lake Rd.,
Ft. Collins, CO 80524.

ALL RIGHTS RESERVED.


ΓòÉΓòÉΓòÉ 11.6.2. Acknowledgments ΓòÉΓòÉΓòÉ

The DCF/2 has been a complex and challenging undertaking.  Without the patience
of our customers and the complete support of Lee Reiswig's OS/2 Team, the
product would not exist today.

Proportional Software gratefully thanks and acknowledges the contributions of
the following individuals in particular:

     For invaluable technical assistance:  The entire IBM OS/2 ISV Technical
     Support Group, and in particular -- Mr. Orlando Portella and Charles Buck
     II. In addition to the IBM OS/2 Technical Support Group, we express our
     appreciation to Mr. Colin Powell, Mr. Felix Miro, Mr. Sam Detweiler, Mr.
     James Taylor and Mr. Jack Boyce.

     For his technical assistance, Mr. Wayne Kovsky of COLORAD/OS2, and for
     their review of and comments on the documentation, Guy Scharf and Christy
     Scharf.

     For the wealth of information their books have provided:  Mr. Mark Nelson,
     Mr. Raymond Westwater, Mr. Robert Lai, Dr. Mike Kogan : Dr. Harvey Dietel,
     Mr. Gilbert Held, Mr. Lawrence Kenah, Ms. Ruth Goldenberg, and Mr. Simon
     Bate.

     For their patience, moral support and encouragement:  Ms. Robin Frank, Mr.
     Toby Pennycuff, Mr. Tim Heacox and Mr. David Jackson.

     For making it all worthwhile:  our daugher Jennifer and son "Boo."