Disk Drive Errors - Sun Microsystems SPARCstation 20 Service Manual

Disk Drive Errors

The following procedure verifies the built-in SCSI controller.
drive error conditions and corrective actions.
To test the disk drive:
Note – To verify if the built-in SCSI controller is defective, test the disk drive
response to the probe-scsi command. To test additional SCSI host adapters added
to the system, use the probe-scsi-all command. Refer to "probe-scsi, probe-scsi-
all" on page 226.
1. At the ok prompt, type probe-scsi.
See the following example.
ok probe-scsi
Target 1
Unit 0 Disk SEAGATE ST31200W SUN1.05802200015063
Copyright (c) 1993 Seagate
All rights reserved 0000
Target 3
Unit 0 Disk CONNER
Target 6
Unit 0 Removable Read Only device
Note – If the disk drive responds and a message is displayed, the system SCSI
controller has successfully probed the devices. This indicates that the system board
is working correctly.
2. If a disk does not respond:
a. Ensure that every SCSI disk and other SCSI devices on the SCSI bus have a
different SCSI address.
Note – Internal SCSI drives are automatically assigned SCSI address 3 (bottom
drive) and 1 (top drive). SCSI address 6 is normally reserved for the optional
internal CD-ROM drive. Do not assign SCSI address 7 to any device. This address is
reserved for the SCSI controller on the system board.
CP30548 SUN0535B0BB93086K4S
TOSHIBA CD-ROM XM4101TA289310/16/93
Chapter 4 Troubleshooting Procedures
lists disk
TABLE 4-3
33