DEC AlphaServer 1000A Owner's Manual page 169

Table 8-8 Troubleshooting Removable Media Problems
Problem
Drive failure.
Duplicate SCSI IDs.
SCSI ID is set to 7
(reserved for host ID).
Duplicate host IDs on a
shared bus.
Faulty cable
termination.
Missing or loose cables.
Cable length.
Missing terminator.
Extra terminator.
AlphaServer 1000A Owner's Guide
Symptom
Drive fault indicator is on.
Valid drives are missing from
the show config display.
Valid drives are missing from
the show config display.
One drive may appear seven
times on the configuration
display.
Valid drives are missing from
the show config display.
One drive may appear seven
times on the configuration
display.
Activity indicators do not come
on. Drive missing from the
show config display.
Activity indicators do not come
on.
Drive missing from the show
config or show device
display. Read/write errors in
the console event log; storage
adapter port failure.
Devices produce errors or device
IDs are dropped.
Action
Try the drive in a different slot to
eliminate slot failure as the cause. If
drive is faulty, replace the drive. If
faulty slot is suspected, try a
working drive in that slot. If it fails,
check for conflicting SCSI IDs. If
none, call service representative.
Correct removable-media SCSI IDs.
Correct SCSI IDs.
Change host ID using the set
pk*0_host_id command.
Check cable termination. Remove
device and inspect cable
connections.
Check cable length: on an 8-bit
SCSI bus (narrow), the entire bus
length must not exceed 6 meters for
single-ended SCSI-2 at 5 MB per
second, or 3 meters for single-ended
SCSI-2 at 10 MB per second.
On a 16-bit SCSI bus (wide), bus
length must not exceed 3 meters.
Attach terminators as needed:
internal SCSI terminator or external
SCSI terminator. (See Chapter 6,
"Configuring.")
Check that SCSI bus is terminated
only at beginning and end. Remove
unnecessary terminators.
Troubleshooting 8-13