VERITAS FlashSnap Point-In-Time-Copy Solutions Administrator's Guide

Preparing a Volume for Instant Snapshot Operations
22 VERITAS FlashSnap Point-In-Time Copy Solutions Administrator’s Guide
Examples of Disk Groups That Can and Cannot be Split
X
SnapshotVo l u m e
Data Plexes Plex
Vo l u m e D C O
Plexes
Snapshot
DCO Plex
X
Split
SnapshotVo l u m e
Data Plexes Plex
Vo l u m e D C O
Plex
Snapshot
DCO Plex
Vo l u m e D C O
Plex
Snapshot
Vo l u m e 1
Data Plexes
Plex
Vo l u m e 1 D C O
Plexes
Snapshot
Vo l u m e
Data Plexes
Plex
Vo l u m e D C O
Plexes
Split
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.
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 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.
Vo l u m e 2
Data Plexes
?
?
Snapshot
DCO Plex
?