User`s guide

Chapter 10: Solving Problems ● 66
Failed Disk Drive Protected by a Hot Spare
When an array is protected by a hot spare, if a disk drive in that array fails the hot spare is
automatically incorporated into the array and takes over for the failed drive.
To recover from the failure:
1 Remove and replace the failed disk drive (following manufacturer’s instructions).
2 If copyback is not enabled—In Adaptec Storage Manager, remove the ‘hot spare’
designation from the original hot spare (the disk drive that was built into the array). Then,
designate a new hot spare to protect the arrays on that controller.
If copyback is enabled—Data is automatically moved back to its original location once the
controller detects that the failed drive has been replaced. No action is required.
Failed Disk Drive Not Protected by a Hot Spare
When a array is not protected by a hot spare, if a disk drive in that array fails, remove and
replace the failed disk drive. The controller detects the new disk drive and begins to rebuild the
array.
If the controller fails to rebuild the array, check that the cables, disk drives, and controllers are
properly installed and connected. Then, if necessary, use Adaptec Storage Manager to rebuild
the array. For instructions, refer to the Adaptec Storage Manager User’s Guide
f or Internal RAID
Storage or online Help.
Failure in Multiple Arrays Simultaneously
If there’s a disk drive failure in more than one array at the same time (one failure per array),
and the arrays have hot spares protecting them, the controller rebuilds the arrays 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. (The array
that includes the disk drive that failed first is rebuilt first, assuming an appropriate hot
spare is available—see bullet above.)
If there are more disk drive failures than hot spares, see Failed Disk Drive Not Protected by a Hot
Spare.
If copyback is enabled, data is moved back to its original location once the controller detects
that the failed drive has been replaced.
Disk Drive Failure in a RAID 0 Array
Because RAID 0 volumes do not include redundancy, if a disk drive fails in a RAID 0 array, the
data can’t be recovered.
Correct the cause of the failure or replace the failed disk drives. Then, restore your data (if
available).