Table 8-8: Troubleshooting Removable-Media Problems - Compaq AlphaServer 1000A Owner's Manual

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
Symptom
Drive fault indicator is lit.
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 light.
Drive missing from the show
config display.
Activity indicators do not light. Check cable length: on an
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.
AlphaServer 1000A Rackmount Owner's Guide 8-13
Troubleshooting Your System
Action
Replace the drive.
Correct the removable-
media SCSI IDs.
Correct the SCSI IDs.
Change host ID using the
set pk*0_host_id
command.
Check cable termination.
Remove device and
inspect cable connections.
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
Your System)"
Check that SCSI bus is
terminated only at
beginning and end.
Remove unnecessary
terminators.