HP Visualize c100 Service Handbook page 131

A4125-66522 FWD Core I/O Board
A
Message: Error on
fwscsi bus?
NO
At least one disk
not found?
NO
System found all fwscsi disks. Pro-
ceed booting to Unix.
System boots Unix?
NO
Is the kernel corrupt? If kernel is
okay, start by replacing the core I/O
board. If system still fails in the
same manner replace the backplane
board.
Troubleshooting the SCSI I/O Board
Possible problems:
1. A single-ended disk or terminator
is connected.
2. Core I/O board is bad, replace it.
3. Disk interface board is bad,
replace it.
YES
4. Bad disk.
Possible problems:
1. Duplicate SCSI ID's assigned. ID
7 is reserved for host adapter.
YES
2. Incorrect cables used. Use only
the FWD 70 ohm cables.
3. Check cabling configuration,
especially maximum allowed
length.
4. Bad disk.
This is a Unix SCSI problem.
Suggestions:
YES
1. Change core I/O board.
2. Check cable type and length,
especially if it exhibits bus timeouts
or I/O resets.
Troubleshooting
103