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194 Sun Fire 280R Server Owner’s Guide • January 2001
Symptom
DVD/CD-ROM or external SCSI drive fails to boot or is not responding to
commands.
Action
Test the response of the drive(s) to the probe-scsi-all command as follows:
1. At the system ok prompt, type:
2. Use the test command to gather more information, type:
If the system has more than one SCSI disk, you must specify an address.
3. If the SCSI device responds correctly to probe-scsi-all, a message similar to
the one shown in “The probe-scsi and probe-scsi-all Commands” on
page 173 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 the problem is still evident after replacing the DVD/CD-ROM drive, replace
the main logic board.
b. 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.
Note – You can also use the probe-scsi-all command to look for failures on the
external UltraSCSI loop.
ok reset-all
ok probe-scsi-all
ok test scsi