Problem mounting SCSI HD in a different computer w/ different Adaptec Controller

[Alan J. McRae]

Please Help!
I have a SCSI hard drive that was formatted and loaded as a secondary
drive on a Pentium sytem with an Adaptec 2940 card and w/ SCO UNIX
Open Server 5.0.0 Host running on its boot drive. I want to mount it
in a different Pentium computer that has an Adaptec 1542 card or say
some other Adaptec SCSI card w/ SCO UNIX Open Server 5.0.4 or greater
running on its boot drive. How come the drive won't mount? Does it
have something to do with the drive geometry or termination or a
BOOTLD driver? What makes the drive seem incompatible to other
Adaptec SCSI controllers? Also, how generic is the Generic Boot
floppy? Shouldn't it allow me to at least boot on a different hardware
configuration and then mount my drive? What would I do if my server
crashed and burned and I had to restore my system onto totally new
hardware? (Hey, stuff gets obsolete real quick nowadays.)
We're baffled by this mount problem.
Any ideas or insights?
Thank you,
Alan

[John Gray]

"Alan J. McRae" wrote:

SCO OSR5* ODT etc. impose a geometry on the disk which will usually
match the BIOS for the particular system. The 154X cards use 64 hds
32 sec and n Cyl. The 2940 will use 64/128/255 for the heads value
depending
on the disk size. The trick here is to put the disk back on the old
controller
and run dparam on that disk to stamp the geometry on that disk. Then
move it to the 154X controller.

If the old system is dead, then you can look at editing a field in the
/etc/conf/pack.d/Sdsk/space.c relink and reboot. Then attempt a mount.
This procedure will not stamp any values on the drive.

good luck
-john