A/UX External disk drives

[Brett Taylor]

Subject: External disk drives
Newsgroups: comp.unix.aux

I wonder if someone is having similar symptoms I am having with
external hard drives while running A/UX.  I have a Mac II with A/UX on
an 80Mb internal drive.  I also have 3 external 80Mb drives, we needed
disk space and required all Apple hardware.  The drives are addressed
c1d0s2, c2d0s2 and c3d0s2.  I have double checked all cabling and
termination.

After running several combinations of disk intensive programs I have
found the following.  Drive 2 has a bad block around 60000.  The disk
intensive programs access all drives randomly.  Reading the bad block
on drive 2 reliably hangs the first drive in the SCSI chain.  I have
rotated the disk around to verify the first in the chain always hangs.

The system prints the following error messages:
Disk c2d0s2 Error: Protocol Error Processing SCSI request
generic disk c2d0s2 Error: Logical block 60430, physical block 60446
SCSI reset
After this message the system is hung and the drive light remains on.
Pressing the furthest reset button gives me the following:
Minimal Unix Debugger
sr = 2000  pc = 10007450
d0 - d7  8 7 64 8 2000 0 0
a0 - a7  0 120002AA 10007300 120003000 50010000 0 11005140 1FF01D4E

Can anyone shed some light on this?  I am in the process of repairing
the bad block with several custom utilities.  Basically read and write
the block, assuming it is ECC and the write succeeds.  If that works I
can at least continue for now.

Sorry no trailer file.
return address, sun!rtech!brett