Recovering a RAID 5 single-disk failure
RAID 5 protects the data with parity information distributed on all member disks. The data can be recovered from the remaining disks if one disk fails.
When a single disk in a RAID 5 disk array fails, the disk
array status changes to Degraded. The disk array remains functional
because the data on the failed disk can be rebuilt using parity and
data on the remaining disks. If a hot spare disk is
available, the controller can rebuild the data on the disk automatically.
If a hot spare disk is not available, you must replace the failed
disk and then initiate a rebuild.
Complete the following steps to initiate a rebuild: