Chapter 11: Solving Problems ● 138Note: A hot spare icon changes from light-blue to dark-blue when it becomes part of a logical drive.To recover from the failure:1 Remove and replace the failed disk drive (following manufacturer’s instructions).2 If copyback is not enabled—Remove the ‘hot spare’ designation from the original hot spare(the disk drive that was built into the logical drive). See page 56 for instructions. Then,designate a new hot spare to protect the logical drives on that controller.If copyback is enabled—Data is automatically moved back to its original location once thecontroller detects that the failed drive has been replaced. No action is required. SeeEnabling Copyback on page 57 for more information.Failed Disk Drive Not Protected by a Hot SpareWhen a logical drive is not protected by a hot spare, if a disk drive in that logical drive fails,remove and replace the failed disk drive. The controller detects the new disk drive and beginsto rebuild the logical drive. You can access the logical drive while it’s rebuilding.For instance, when one of the disk drives fails in the RAID 1 logical drive shown in the nextexample, the logical drive is not automatically rebuilt. The failed disk drive must be removedand replaced before the logical drive can be rebuilt.If the controller fails to rebuild the logical drive, check that the cables, disk drives, andcontrollers are properly installed and connected. Then, if necessary, follow the instructions inRebuilding Logical Drives on page 140.Failure in Multiple Logical Drives SimultaneouslyIf there’s a disk drive failure in more than one logical drive at the same time (one failure perlogical drive), and the logical drives have hot spares protecting them, the controller rebuilds thelogical drives with these limitations:● A hot spare must be of equal or greater size than the failed disk drive it’s replacing.● Failed disk drives are replaced with hot spares in the order in which they failed. (Thelogical drive that includes the disk drive that failed first is rebuilt first, assuming anappropriate hot spare is available—see the previous bullet.)If there are more disk drive failures than hot spares, see Failed Disk Drive Not Protected by a HotSpare on page 138.If copyback is enabled, data is moved back to its original location once the controller detectsthat the failed drive has been replaced. See Enabling Copyback on page 57 for more information.Disk Drive Failure in a RAID 0 Logical DriveBecause RAID 0 volumes do not include redundancy, if a disk drive fails in a RAID 0 logicaldrive, the data can’t be recovered.
