User's Manual

Troubleshooting 263

A Rebuild Completes with Errors

In some situations, a rebuild may complete successfully while also reporting

errors. This may occur when a portion of the disk containing redundant

(parity) information is damaged. The rebuild process can restore data from

the healthy portions of the disk but not from the damaged portion.

When a rebuild is able to restore all data except data from damaged portions

of the disk, it indicates successful completion while also generating alert

2163.

For information on Alert Messages, see the Server Administrator Messages

Reference Guide.

The rebuild may also report sense key errors. In this situation, take the

following actions to restore the maximum data possible:

Back up the degraded virtual disk onto a fresh (unused) tape.

- If the backup is successful—If the backup completes successfully

then the user data on the virtual disk has not been damaged. In this

case, you can continue with step 2.

- If the backup encounters errors—If the backup encounters errors

then the user data has been damaged and cannot be recovered from the

virtual disk. In this case, the only possibility for recovery is to restore

from a previous backup of the virtual disk.

Perform a Check Consistency on the virtual disk that you have backed up

onto tape.

Restore the virtual disk from the tape onto healthy physical disks.

Cannot Create a Virtual Disk

You might be attempting a RAID configuration that is not supported by the

controller. Check the following:

• How many virtual disks already exist on the controller? Each controller

supports a maximum number of virtual disks. For more information, see

Maximum Number of Virtual Disks per Controller.

• Is there adequate available space on the disk? The physical disks that you

have selected for creating the virtual disk must have an adequate amount

of free space available.