Sun Microsystems 280R manual At the system ok prompt, type

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-allcommand as follows:

1. At the system ok prompt, type:

ok reset-all

ok probe-scsi-all

2.Use the test command to gather more information, type:

ok test scsi

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-scsiand probe-scsi-allCommands” 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-allcommand to look for failures on the external UltraSCSI loop.

194 Sun Fire 280R Server Owner’s Guide • January 2001