Specifications

AlphaServer 1000A Owner's Guide Troubleshooting • 8-13
Table 8-8 Troubleshooting Removable Media Problems
Problem Symptom Action
Drive failure. Drive fault indicator is on. 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.
Duplicate SCSI IDs. Valid drives are missing from
the show config display.
Correct removable-media SCSI IDs.
SCSI ID is set to 7
(reserved for host ID).
Valid drives are missing from
the show config display.
One drive may appear seven
times on the configuration
display.
Correct SCSI IDs.
Duplicate host IDs on a
shared bus.
Valid drives are missing from
the show config display.
One drive may appear seven
times on the configuration
display.
Change host ID using the set
pk*0_host_id command.
Faulty cable
termination.
Missing or loose cables.
Activity indicators do not come
on. Drive missing from the
show config display.
Check cable termination. Remove
device and inspect cable
connections.
Cable length. Activity indicators do not come
on.
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.
Missing terminator. Drive missing from the show
config or show device
display. Read/write errors in
the console event log; storage
adapter port failure.
Attach terminators as needed:
internal SCSI terminator or external
SCSI terminator. (See Chapter 6,
"Configuring.")
Extra terminator. Devices produce errors or device
IDs are dropped.
Check that SCSI bus is terminated
only at beginning and end. Remove
unnecessary terminators.