Adaptec 5805Z User Guide - Page 62

Recovering from a Disk Drive Failure, Failed Disk Drive Protected by a Hot Spare

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Page 62 highlights

Chapter 10: Solving Problems ● 62 Recovering from a Disk Drive Failure This section explains how to recover when a disk drive fails: ● If the array was protected by a hot spare (see page 62). ● If the array was not protected by a hot spare (see page 62). ● If there is a disk drive failure in more than one array simultaneously (see page 62). ● If it is a RAID 0 array (see page 63). ● If multiple disk drives fail within the same array (see page 63). Note: In DAS environments, Adaptec Storage Manager uses the term logical drives when referring to arrays (see page 12). 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. 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. Make sure that the new disk drive is equal or greater in size than the failed disk drive. Then, if necessary, use Adaptec Storage Manager to rebuild the array. For instructions, refer to the Adaptec Storage Manager User's Guide 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.

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Chapter 10: Solving Problems
●
62
Recovering from a Disk Drive Failure
This section explains how to recover when a disk drive fails:
●
If the array was protected by a hot spare (see
page 62
).
●
If the array was
not
protected by a hot spare (see
page 62
).
●
If there is a disk drive failure in more than one array simultaneously (see
page 62
).
●
If it is a RAID 0 array (see
page 63
).
●
If multiple disk drives fail within the same array (see
page 63
).
Note:
In DAS environments, Adaptec Storage Manager uses the term
logical drives
when
referring to
arrays
(see
page 12
).
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.
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. Make sure that the new disk drive is equal or greater in size
than the failed disk drive. Then, if necessary, use Adaptec Storage Manager to rebuild the array.
For instructions, refer to the
Adaptec Storage Manager User’s Guide
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
.