Adaptec 5405 User Guide - Page 138

Failed Disk Drive Not Protected by a Hot Spare, Failure in Multiple Logical Drives Simultaneously

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Chapter 11: Solving Problems ● 138 Note: 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 the controller detects that the failed drive has been replaced. No action is required. See Enabling Copyback on page 57 for more information. Failed Disk Drive Not Protected by a Hot Spare When 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 begins to 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 next example, 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 on page 140. Failure in Multiple Logical Drives Simultaneously If there's a disk drive failure in more than one logical drive at the same time (one failure per logical drive), and the logical drives have hot spares protecting them, the controller rebuilds the logical 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. (The logical drive that includes the disk drive that failed first is rebuilt first, assuming an appropriate 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 Hot Spare on page 138. If copyback is enabled, data is moved back to its original location once the controller detects that the failed drive has been replaced. See Enabling Copyback on page 57 for more information. Disk Drive Failure in a RAID 0 Logical Drive Because RAID 0 volumes do not include redundancy, if a disk drive fails in a RAID 0 logical drive, the data can't be recovered.

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Chapter 11: Solving Problems
●
138
Note:
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 the
controller detects that the failed drive has been replaced. No action is required. See
Enabling Copyback
on page 57
for more information.
Failed Disk Drive
Not
Protected by a Hot Spare
When 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 begins
to 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 next
example, 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
on page 140
.
Failure in Multiple Logical Drives Simultaneously
If there’s a disk drive failure in more than one logical drive at the same time (one failure per
logical drive), and the logical drives have hot spares protecting them, the controller rebuilds the
logical 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. (The
logical drive that includes the disk drive that failed first is rebuilt first, assuming an
appropriate 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 Hot
Spare
on page 138
.
If copyback is enabled, data is moved back to its original location once the controller detects
that the failed drive has been replaced. See
Enabling Copyback
on page 57
for more information.
Disk Drive Failure in a RAID 0 Logical Drive
Because RAID 0 volumes do not include redundancy, if a disk drive fails in a RAID 0 logical
drive, the data can’t be recovered.