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1992-11-03
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___________________________________________________________________________
STAC FAX STAC FAX
Title: Backing Up Stacker Drives
STACKER NOTE TEC004 - 2/20/92 STAC FAX Index #2404
___________________________________________________________________________
Background.
You can use your favorite backup program, like Fastback, Norton Backup,
or the DOS backup program to back up your Stacker drives. A Stacker drive
may be backed up like any other drive. If you Stacked drive C:, have your
backup program back up the files on Stacker drive C:.
Will the backed up files be in compressed or uncompressed form?
Stacker "Un-Stacks" files as they are read from the hard drive then hands
them to the backup software in their original, uncompressed state. If the
backup software uses compression, it will recompress the files before
storing them to diskette or tape. This means that the files can be
restored to any drive, Stacked or not.
What about the STACVOL file and the files on the uncompressed host drive?
The STACVOL.xxx file contains all the files and free space for the
Stacker drive. Therefore, you do not need to back up this file if the
Stacker drive has been backed up. In addition to backing up your Stacker
drives, you will want to back-up the boot drive. If you have Stacked
drive C: it will be the drive that host's the C: Stacker drive.
For example, to determine the boot drive, use the "STACKER" command.
Type:
C:\STACKER\STACKER <ENTER>
The output will look similar to:
Stacker Disk Mount Utility - 2.01, (c) 1990-92 Stac Electronics, Carlsbad, CA
Stacker drive map:
Drive C: was drive D: at boot time [ D:\STACVOL.DSK = XX.XMB ]
Drive D: was drive C: at boot time
The boot drive is the drive that "was drive C: at boot time".
In this example, Drive D: is the boot drive and host drive for Stacker
drive C:. To backup in this situation, instruct your software to backup
drive C: and D: but tell it not to backup D:\STACVOL.DSK. That's because
D:\STACVOL.DSK is the C: drive !
How do I restore my system in the event of a hard disk crash?
Depending on the severity of the crash, you may need to repartition and
reformat the drive. Next, you would need to install DOS. Then, restore
the boot drive files from backup. The next step is to install Stacker
to create the compressed drive(s). But before you do this, edit
C:\Config.sys to remove the Stacker device driver commands. (They will be
added when you reinstall Stacker.) The final step is to restore the
files from backup to the Stacker drive(s).
___________________________________________________________________________
Copyright 1992, Stac Electronics STAC FAX (619) 431-6712