Sun Microsystems 280R manual Scsi Controller Failure, Power Supply Failure

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-allcommand. 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-allcommand as follows:

1.At the ok prompt, type:

ok probe-scsi-all

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:

ok test scsi

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

Chapter 6 Diagnostics, Monitoring, and Troubleshooting 195