VERITAS Volume Manager 4.1 Administrator's Guide

Administering Hot-Relocation
Moving and Unrelocating Subdisks
Chapter 9 343
Moving and Unrelocating Subdisks
When hot-relocation occurs, subdisks are relocated to spare disks and/or
available free space within the disk group. The new subdisk locations
may not provide the same performance or data layout that existed before
hot-relocation took place. You can move the relocated subdisks (after
hot-relocation is complete) to improve performance.
You can also move the relocated subdisks off the spare disks to keep the
spare disk space free for future hot-relocation needs. Another reason for
moving subdisks is to recreate the configuration that existed before
hot-relocation occurred.
During hot-relocation, one of the electronic mail messages sent to root is
shown in the following example:
To: root
Subject: Volume Manager failures on host teal
Attempting to relocate subdisk disk02-03 from plex home-02.
Dev_offset 0 length 1164 dm_name disk02 da_name c0t5d0.
The available plex home-01 will be used to recover the data.
This message has information about the subdisk before relocation and
can be used to decide where to move the subdisk after relocation.
Here is an example message that shows the new location for the
relocated subdisk:
To: root
Subject: Attempting VxVM relocation on host teal
Volume home Subdisk disk02-03 relocated to disk05-01,
but not yet recovered.
Before you move any relocated subdisks, fix or replace the disk that
failed (as described in “Removing and Replacing Disks” on page 97).
Once this is done, you can move a relocated subdisk back to the original
disk as described in the following sections.