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TECHNOTE
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1990-10-31
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TECHNICAL NOTES FOR V1.02
The following information may be useful in installing and operating
this system.
1. This version supports both caching and non-caching
PS/2 SCSI controllers.
2. The SCSI driver is IBMSCSI.OBJ v1.02. This information
may also be displayed in the Channel Statistics screen
of FCONSOLE.
3. FCONSOLE displays incorrect disk channel information in
three of its screens; Channel Statistics, Disk Mapping
Information, and Disk Statistics. Even if only one SCSI
adapter is installed in the server, FCONSOLE displays as
if two channels (controllers) exist. Simply ignore the
second entry. This will be corrected in a future version.
4. This version has been tested with PS/2 Models 65SX 16MHz,
70 25MHz, 80 20MHz and 80 25MHz with both caching and
non-caching SCSI controllers. LAN cards used are NE/2
3C523. It was also tested with two SCSI adapter boards
installed, and with five embedded SCSI drives attached
to a single adapter board.
The following is a more detailed discussion on the limitations of
this version of the IBM SCSI driver and PS/2 SCSI controllers in general.
An understanding of this discussion is not required for installation of a
basic the system.
NOTE: IBMSCSI.OBJ v1.02 supports fixed drives, not removables
Version 1.02 (900731) of the IBMSCSI.OBJ NetWare 286 disk driver reports
logical controller numbers to NetWare rather than the physical SCSI
Controller numbers for attached disk drives.
For each PS/2 SCSI Adapter board, the physical to logical controller number
mapping is accomplished by reversing the order of physical SCSI Controller
numbers and sequentially renumbering them starting with zero. (See Fig. 1
and 'BACKGROUND' below).
Physical Logical
SCSI NetWare
Controller # Controller #
------------ ------------
6 --> 0
4 --> 1
2 --> 2
1 --> 3
0 --> 4
Fig. 1. Example Mapping for Five Devices
HARDWARE INSTALLATION
NOTE: The SCSI address of the NetWare boot device attached to an IBM PS/2
SCSI Adapter card must be 6,0. Therefore, the boot device's address
jumpers (or switches) must be set at six. The IBM PS/2 SCSI Adapter at
I/O base address 3540h (hex) must have the NetWare boot device attached
to it AND it must physically be in a slot to the left of any other IBM
PS/2 SCSI Adapter (looking from the front of the machine; this equates
to the lowest slot number of any other PS/2 SCSI Adapter).
The default NetWare channel configurations are hard-coded in the v1.02
driver. Channel 0 uses I/O base address 3540h. Channel 1 uses I/O base
address 3548h. If there is only one IBM PS/2 SCSI Adapter card in the
system, the NetWare FCONSOLE utility will show TWO channels. Channel 0 is
used for disk communication with the card which is present at I/O base
address 3540h. Although assigned to a card which is not present (at 3548h),
Channel 1 is not used and its presence does not adversely effect the
operation of NetWare. The I/O base address 3578h is not supported in the
v1.02 driver. Adaptec 4000 Series bridge controllers do not support the full
SCSI Common Command Set and, therefore, do not work with the PS/2 SCSI
Adapter.
The v1.02 driver has been tested with: Model 65SX 16 MHz, Model 70 386 25
MHz, Model 80 20 MHz and 25 MHz. LAN cards used: NE/2 and 3C523.
BACKGROUND
----------
During the NetWare 286 network generation process (using either NETGEN or
ELSGEN), and while using other NetWare disk utilities such as COMPSURF, the
user encounters a screen which describes the data storage devices which are
attached to the server. Three numbers are used to identify a device: the
Channel number, the Controller number, and the Drive number.
The Channel number (0 through 4) is the NetWare logical communication path
with a disk controller card. The Controller number (for non-SCSI controller
cards) refers to the disk controller card number (usually 0 or 1). The
Drive number (for non-SCSI devices) refers to the logical number of the
device attached to the disk controller card (usually 0 or 1).
The SCSI (Small Computer System Interface) specification uses SCSI Controller
numbers and LUNs (Logical Unit Numbers) to identify a SCSI device on a SCSI
bus. SCSI Controller numbers (which range from 0 to 7) represent a SCSI
Controller address on the SCSI bus. Each SCSI Controller can theoretically
have up to eight attached devices, each identified with a LUN. A device's
complete SCSI address consists of the SCSI Controller number it is attached
to and its own LUN. (Example: 6,0).
Embedded [controller] SCSI drives have a built-in SCSI controller. Therefore,
only one LUN is possible (LUN = 0). The drive's SCSI address jumpers (or
switches) correspond to the SCSI Controller address. Whatever address they
are set at becomes the first digit in the complete SCSI address of the
device. (Example: an embedded SCSI drive with address switches set at 4 has
a SCSI address of 4,0).
In general, physical SCSI addresses are mapped into NetWare's logical device
identification scheme with the SCSI Controller number becoming the NetWare
Controller number and the SCSI LUN becoming the NetWare Drive number.
However, in the case of the v1.02 IBMSCSI driver, the physical SCSI
Controller number is mapped to the logical NetWare Controller number by
reversing the order of physical SCSI Controller numbers and sequentially
renumbering them starting with zero.
Therefore, the Controller numbers in NetWare utility device identification
screens (such as in INSTALL, COMPSURF, or FCONSOLE) represent logical
controller numbers.