Troubleshooting Your System
AlphaServer 1000A Rackmount Owner’s Guide 8-13
Table 8–8: Troubleshooting Removable-Media Problems
Problem
Symptom
Action
Drive failure
Drive fault indicator is lit.
Replace the drive.
Duplicate SCSI IDs
Valid drives are missing from
the
show config
display.
Correct the 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 the 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 light.
Drive missing from the
show
config
display.
Check cable termination.
Remove device and
inspect cable connections.
Cable length
Activity indicators do not light.
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
Your System)"
Extra terminator
Devices produce errors or
device IDs are dropped.
Check that SCSI bus is
terminated only at
beginning and end.
Remove unnecessary
terminators.
