Gateway 850 User Manual page 54

Chapter 4: Troubleshooting
SCSI bus
Symptom
SCSI bus hangs,
SCSI bus
excessively
retries, and/or
drives drop offline.
50
Probable cause
Faulty connectivity.
Faulty SAF-TE Disk
I/O card (JBOD or
Daisy-
chained enclosure)
or Host I/O card.
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Solution
Re-check the cable connections to the SAF-TE
Disk I/O card and/or Host Disk I/O card.
If you have daisy-chained storage systems
connected on the SCSI bus, you will need to
perform some fault isolation.
If all the drives on one bus are offline, start with the
daisy-chain storage system. Disconnect the data
cable. If the remaining drives return to a normal
state it indicates that the isolated storage system
has the faulty component.
If this does not return the remaining drives to a
normal state, it is a good indication that the problem
is in the first storage system and/or its SAF-TE Disk
I/O card.
You may use the SAF-TE Disk I/O card from the
other storage system or a "new" known good card.
Substitute this card for the suspect card and it
should return the storage system bus to a normal
condition.
NOTE: A return to a normal condition is indicated
by the drives coming back online.
After the faulty card is replaced, begin
re-connecting the data cables on the SAF-TE Disk
I/O card, noting whether the SCSI bus and drives
remain in a normal state.
Re-check the cables to the SAF-TE Disk I/O card,
Host I/O card, and the host adapter.
Replace the SAF-TE Disk I/O card or Host I/O card.