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Chapter 6 Diagnostics, Monitoring, and Troubleshooting 195
SCSI Controller Failure
Symptom
An external SCSI drive fails to boot or is not responding to commands.
Action
To check whether the main logic board SCSI controllers are defective, first test the
external drive response to the probe-scsi-all command. Then run OpenBoot
Diagnostics by entering test scsi at the ok prompt. You can use the OpenBoot
PROM printenv command to display the OpenBoot PROM configuration variables
stored in the system NVRAM. The display includes the current values for these
variables as well as the default values. See “The printenv Command” on page 171
for more information.
Test the external drive response to the probe-scsi-all command as follows:
1. At the ok prompt, type:
If a message is displayed for each installed disk, the system SCSI controllers have
successfully probed the devices. This indicates that the main logic board is working
correctly.
2. Gather more information by using the test command, type:
3. If a disk does not respond, replace the unresponsive drive.
4. If the problem remains after replacing the drive, contact your qualified service
provider to replace the associated SCSI cable and backplane.
Power Supply Failure
If there is a problem with a power supply, the system fault indicator lights on the
front panel. If you have more than one power supply, then you can use the LEDs
located on the power supplies themselves to identify the faulty supply. The power
ok probe-scsi-all
ok test scsi