HP Veritas Volume Manager 5.0 -UX 11i v3 manual Configuring a system for hot-relocation

Administering hot-relocation

Configuring a system for hot-relocation

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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).