User`s guide

StorageWorks RAID Array 200 Controller Installation and Standalone Configuration Utility
7–56 EK–SWRA2–IG. C01
7.5.4 Troubleshooting a Failed Rebuild
Sometimes the utility fails to rebuild data onto a replacement disk. A rebuild
failure occurs because of errors with one of the disks from which the utility tries
to rebuild the data. For example, if you replace a failed drive from a drive group
consisting of three drives on which you configured a logical RAID drive with
parity, RAID 5, for instance, and the utility fails to rebuild data onto the
replacement drive, one of the two drives in the group, not the replacement drive,
has errors.
You will know that a rebuild failed when the status of the replacement drive
remains WOL (write only). After a successful rebuild the status of the
replacement drive changes to OPT (optimal).
Because the rebuild operation runs as a background process, the utility records
any bad block errors that occur during a rebuild in a Bad Block Table. If a
rebuild fails, check the Bad Block Table for errors.
To view the Bad Block Table, invoke the standalone configuration utility, and
follow these steps:
1. Use the up and down arrow keys to highlight the Tools option from the main
menu; and press the Enter key to select it. The utility displays the Tools
menu as shown in Figure 7–6.
2. Use the up and down arrow keys to highlight the Bad Block Table option
from the Tools menu, and press the Enter key to select it. The utility displays
the View Bad Block Table menu. You can select one of these options:
• View Rebuild BBT
• View Write Back BBT
If you have Write-Back cache enabled, the bad block table receives
information on any errors encountered during a write. You can use the
View Write Back BBT option on the View Bad Block Table menu to
view this information. This option works like the View Rebuild BBT.
3. Select the View Rebuild BBT. The utility displays bad blocks on the logical
RAID drive, if any, including the block number and the number of
consecutive bad blocks encountered; as shown in Figure 7–33.
4. Press any key to return to the Tools menu; the utility clears Rebuild Bad
Block Table once you exit it.
5. Press the Esc key to return to the main menu.