15.3.2 Failed Disk Drive Not Protected by a Hot Spare
If a disk drive in a logical drive fails when the logical drive is not protected by a hot spare, remove and replace the failed disk drive. The controller detects the new disk drive and begins to rebuild it. You can access the logical drive while it's rebuilding.
For example, when one of the disk drives fails in a RAID 1 logical drive, the logical drive is not automatically rebuilt. The failed disk drive must be removed and replaced before the logical drive can be rebuilt.
If the controller fails to rebuild the logical drive, check that the cables, disk drives, and controllers are properly installed and connected. Then, if necessary, follow the instructions in Rebuilding Logical Drives.