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392 Administering hot-relocation
Moving and unrelocating subdisks
subdisks using vxassist” on page 392 and “Moving and unrelocating subdisks
using vxunreloc” on page 392.
Moving and unrelocating 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:
# 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 and unrelocating 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.
If vxunreloc 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