Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Moving relocated subdisks using vxassist
You can use the vxassist command to move and unrelocate subdisks. For example,
to move the relocated subdisks on mydg05 belonging to the volume home back to
mydg02, enter the following command.
Note: The ! character is a special character in some shells. The following example
shows how to escape it in a bash shell.
# vxassist -g mydg move home \!mydg05 mydg02
Here, \!mydg05 specifies the current location of the subdisks, and mydg02 specifies
where the subdisks should be relocated.
If the volume is enabled, subdisks within detached or disabled plexes, and detached
log or RAID-5 subdisks, are moved without recovery of data.
If the volume is not enabled, subdisks within STALE or OFFLINE plexes, and stale
log or RAID-5 subdisks, are moved without recovery. If there are other subdisks
within a non-enabled volume that require moving, the relocation fails.
For enabled subdisks in enabled plexes within an enabled volume, data is moved
to the new location, without loss of either availability or redundancy of the volume.
Moving relocated subdisks using vxunreloc
VxVM hot-relocation allows the system to automatically react to I/O failures on
a redundant VxVM object at the subdisk level and then take necessary action to
make the object available again. This mechanism detects I/O failures in a subdisk,
relocates the subdisk, and recovers the plex associated with the subdisk. After
the disk has been replaced, vxunreloc allows you to restore the system back to
the configuration that existed before the disk failure. vxunreloc allows you to
move the hot-relocated subdisks back onto a disk that was replaced due to a failure.
When vxunreloc is invoked, you must specify the disk media name where the
hot-relocated subdisks originally resided. 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,vxunreloc does nothing except return
an error.
vxunreloc 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 offset as long as the destination disk is large enough to accommodate
all the subdisks.
419Administering hot-relocation
Moving relocated subdisks