Ultra Start 450 SERIES Instruction Manual download pdf (Page 428)

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101

408 Ultra Enterprise 450 Server Owner’s Guide • July 1997

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:

2. If the SCSI device responds correctly to probe-scsi-all, a message similar to

the one on page 400 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. See “OBP probe-scsi and

probe-scsi-all Commands” on page 399 for more information.

ok reset-all

ok probe-scsi-all

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