VERITAS Volume Manager 3.1 Administrator's Guide

Volume Manager Operations

Hot-Relocation

Chapter 3106

Volume Manager provides the vxunreloc utility, which can be used to

restore the system to the same conﬁguration that existed before the disk

failure. The vxunreloc utility allows you to move the hot-relocated

subdisks back onto a disk that was replaced due to a disk failure.

When the vxunreloc utility is invoked, you must specify the disk media

name where the hot-relocated subdisks originally resided so that when

vxunreloc moves the subdisks, it moves them to the original offsets. If

you try to unrelocate to a disk that is smaller than the original disk that

failed, the vxunreloc utility does nothing except return an error.

The vxunreloc program provides an option to move the subdisks to a

different disk from where they were originally relocated. It also provides

an option to unrelocate subdisks to a different offsets if the destination

disk is large enough to accommodate all of the subdisks.

If the vxunreloc utility cannot replace the subdisks back to the same

original offsets, a force option is available that allows you to move the

subdisks to a speciﬁed disk without using the original offsets. See the

vxunreloc(1M) manual page for more information.

The following examples demonstrate the use of the vxunreloc program.

Example 1:

Assume that disk01 failed and all the subdisks were relocated. After

disk01 is replaced, use vxunreloc to move all the hot-relocated subdisks

back to disk01, as follows:

# vxunreloc -g newdg disk01

Example 2:

The vxunreloc utility provides the -n option to move the subdisks to a

different disk from where they were originally relocated.

Assume that disk01 failed, and that all of the subdisks that resided on it

were hot-relocated to other disks. After the disk is repaired, it is added

back to the disk group using a different name, e.g, disk05. If you want to

move all the hot-relocated subdisks back to the new disk, use the

following command:

# vxunreloc -g newdg -n disk05 disk01

Example 3:

Assume that disk01 failed and the subdisks were relocated and that you