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

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.

   1. If one drive does not respond to the SCSI controller probe but the others do, replace the unresponsive drive.

   2. 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.