VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 4, Creating and Administering Disk Groups
Reorganizing the Contents of Disk Groups
127
Examples of Disk Groups That Can and Cannot be Split
X
SnapshotVolume
Data Plexes Plex
Volume DCO
Plexes
Snapshot
DCO Plex
X
Split
SnapshotVolume
Data Plexes Plex
Volume DCO
Plex
Snapshot
DCO Plex
Volume DCO
Plex
Snapshot
Volume 1
Data Plexes
Plex
Volume 1 DCO
Plexes
Snapshot
DCO Plex
?
Snapshot
Volume
Data Plexes
Plex
Volume DCO
Plexes
Split
Snapshot
DCO Plex
?
?
?
The disk group can be split as the DCO plexes
are on the same disks as the data plexes and
can therefore accompany their volumes.
The disk group cannot be split as the DCO
plexes have been separated from their data
plexes and so cannot accompany their
volumes. One solution is to relocate the DCO
plexes. In this example, it may be necessary to
use an additional disk in the disk group as an
intermediary to swap the plexes.
The disk group can be split as the
DCO plexes can accompany their
volumes even though they are on
different disks. 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 that contain the
data plexes of Volume 2.
Possible solutions are to
relocate the snapshot DCO
plex to the disk containing
the snapshot plex, or to
another suitable disk that
can be moved.
Volume 2
Data Plexes