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

Figure 6-7
Examples of disk groups that can and cannot be split
Volume
data plexes
Snapshot
plex
Volume DCO
plexes
Snapshot
DCO plex
The disk group can be split as the DCO
plexes are on dedicated disks, and can
therefore accompany the disks that
contain the volume data
Split
Split
Volume 1
data plexes
Volume 2
data plexes
Volume 1
DCO plexes
The disk group cannot be split as the DCO
plexes cannot accompany their volumes.
One solution is to relocate the DCO plexes. In
this example, use an additional disk in the
disk group as an intermediary to swap the
misplaced DCO plexes. Alternatively, to
improve DRL performance and resilience,
allocate the DCO plexes to dedicated disks.
The disk group can be split as the DCO
plexes can accompany their volumes.
However, you may not wish the data in
the portions of the disks marked “?” to
be moved as well.
The disk group cannot be
split as this would separate
the disks containing
Volume 2’s data plexes.
Possible solutions are to
relocate the snapshot DCO
plex to the snapshot plex
disk, or to another suitable
disk that can be moved.
?
?
?
?
Snapshot
plex
Snapshot
plex
Snapshot
plex
Volume
data plexes
Volume
data plexes
Snapshot
DCO plex
Snapshot
DCO plex
Snapshot
DCO plex
Volume
DCO plexes
Volume
DCO plex
Volume
DCO plex
Moving objects between disk groups
To move a self-contained set of VxVM objects from an imported source disk group
to an imported target disk group, use the following command:
257Creating and administering disk groups
Reorganizing the contents of disk groups