Sun Microsystems Enterprise 250 Owner's Manual page 276

Disk or CD-ROM Drive Failure
Symptom
A disk drive read, write, or parity error is reported by the operating system or a
software application.
A CD-ROM drive read error or parity error is reported by the operating system or a
software application.
Action
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 on page 252 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
258 Sun Enterprise 250 Server Owner's Guide • June 1998