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385Administering hot-relocation
Configuring a system for hot-relocation
does not take place. If relocation is not possible, the system administrator is
notified and no further action is taken.
From the eligible disks, hot-relocation attempts to use the disk that is “closest”
to the failed disk. The value of “closeness” depends on the controller, target, and
disk number of the failed disk. A disk on the same controller as the failed disk is
closer than a disk on a different controller. A disk under the same target as the
failed disk is closer than one on a different target.
Hot-relocation tries to move all subdisks from a failing drive to the same
destination disk, if possible.
When hot-relocation takes place, the failed subdisk is removed from the
configuration database, and VxVM ensures that the disk space used by the failed
subdisk is not recycled as free space.
Configuring a system for hot-relocation
By designating spare disks and making free space on disks available for use by
hot relocation, you can control how disk space is used for relocating subdisks in
the event of a disk failure. If the combined free space and space on spare disks is
not sufficient or does not meet the redundancy constraints, the subdisks are not
relocated.
■ To find out which disks are spares or are excluded from hot-relocation, see
“Displaying spare disk information” on page 386.
You can prepare for hot-relocation by designating one or more disks per disk
group as hot-relocation spares.
■ To designate a disk as being a hot-relocation spare for a disk group, see
“Marking a disk as a hot-relocation spare” on page 387.
■ To remove a disk from use as a hot-relocation spare, see “Removing a disk
from use as a hot-relocation spare” on page 388.
If no spares are available at the time of a failure or if there is not enough space
on the spares, free space on disks in the same disk group as where the failure
occurred is automatically used, unless it has been excluded from hot-relocation
use.
■ To exclude a disk from hot-relocation use, see “Excluding a disk from
hot-relocation use” on page 388.
■ To make a disk available for hot-relocation use, see “Making a disk available
for hot-relocation use” on page 389.
Depending on the locations of the relocated subdisks, you can choose to move
them elsewhere after hot-relocation occurs (see “Configuring hot-relocation to
use only spare disks” on page 390).