User`s guide

StorageWorks RAID Array 200 Controller Installation and Standalone Configuration Utility
7–54 EK–SWRA2–IG. C01
7.5.3 Rebuilding a Drive
Rebuilding a drive recreates a failed drive's data onto a replacement drive. You
can rebuild a drive only for configurations with redundant RAID levels (RAID 1,
RAID 0 + 1, and RAID 5). If a drive fails in a configuration without a redundant
RAID level (RAID 0, JBOD) you can not recover data from the failed drive
using the standalone configuration utility.
NOTE
Upon detection of a drive failure, replace the drive
as soon as possible to minimize the chance of
data loss because of a second drive failure.
If your storage enclosure has StorageWorks Fault Management support, then the
controller will automatically start to rebuild the logical RAID drive when you
replace a failed drive in a redundant RAID set. If a hot spare drive exists in the
shelf, then you do not have to replace the failed drive, because a rebuild will
automatically start on that hot spare device in the event of a drive failure in a
redundant RAID set.
In addition, the controller supports queuing rebuilds. Therefore, in the event that
a rebuild is in process and a drive should fail in another drive group, the
controller will start a rebuild of that second logical RAID drive group after
completing the first rebuild, given you replace the second failed drive or another
hot spare is present in the shelf.
In the event that your storage enclosure does not have StorageWorks Fault
Management, you can use the standalone configuration utility to manually
rebuild a logical RAID drive after replacing a failed drive.
See Chapter 6 for a description of all the methods for Rebuilding a Drive.
Use the Rebuild a drive option on the main menu if:
• You did not define a hot spare drive
• Your storage enclosure does not support hot swap capability
• You manually failed a drive and did not replace it
• You want to rebuild a drive while a rebuild is in progress