Chapter 12: Solving Problems ● 117Failed Disk Drive Protected by a Hot SpareWhen a logical drive is protected by a hot spare, if a disk drive in that logical drive fails the hotspare is automatically incorporated into the logical drive and takes over for the failed drive.For instance, when a disk drive fails in the RAID 5 logical drive shown in the next example, thelogical drive is automatically rebuilt (its data is reconstructed) using the hot spare in place ofthe failed drive. You can’t access the logical drive until the rebuilding is complete.Note: In this example, the color of the hot spare changed from light-blue to dark-blue, showingthat it is now 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 76 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 79 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.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 119....and logical drive is rebuilt with hot spareDisk drive showsFailed status......hot spare takes over...
