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Troubleshooting
Troubleshooting the SCSI I/O Board
103
A4125-66522 FWD Core I/O Board
Possible problems:
1. Duplicate SCSI ID’s assigned. ID
7 is reserved for host adapter.
2. Incorrect cables used. Use only
the FWD 70 ohm cables.
3. Check cabling configuration,
especially maximum allowed
length.
4. Bad disk.
Message: Error on
fwscsi bus?
At least one disk
not found?
System boots Unix?
YES
NO
A
YES
YES
NO
NO
This is a Unix SCSI problem.
Suggestions:
1. Change core I/O board.
2. Check cable type and length,
especially if it exhibits bus timeouts
or I/O resets.
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.
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.
4. Bad disk.
System found all fwscsi disks. Pro-
ceed booting to Unix.