Scsi Controller Failures - Sun Microsystems Enterprise 250 Owner's Manual

Action
1. Replace the drive indicated by the failure message.
Symptom
Disk drive or CD-ROM drive fails to boot or is not responding to commands.
Action
Test the drive response to the probe-scsi-all command as follows:
1. At the system ok prompt, enter:
ok reset-all
ok probe-scsi-all
2. If the SCSI device responds correctly to probe-scsi-all, a message similar
to the one above is printed out.
If the device responds and a message is displayed, the system SCSI controller has
successfully probed the device. This indicates that the main logic board is
operating correctly.
a. If one drive does not respond to the SCSI controller probe but the others
do, replace the unresponsive drive.
b. If only one internal disk drive is configured with the system and the
probe-scsi-all test fails to show the device in the message, replace the
drive. If the problem is still evident after replacing the drive, replace the
main logic board. If replacing both the disk drive and the main logic board
does not correct the problem, replace the associated UltraSCSI data cable
and UltraSCSI backplane.

SCSI Controller Failures

To check whether the main logic board SCSI controllers are defective, test the drive
response to the probe-scsi command. To test additional SCSI host adapters added
to the system, use the probe-scsi-all command. You can use the OBP printenv
command to display the OpenBoot PROM configuration variables stored in the
system NVRAM. The display includes the current values for these variables as well
as the default values. See "OBP printenv Command" on page 264 for more
information.
1. At the ok prompt, enter:
Diagnostics and Troubleshooting
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