Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 9, Administering Volume Snapshots
Creating Multiple Snapshots
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◆ vxsnap split dissociates a snapshot and its dependent snapshots from its parent
volume. The snapshot volume that is to be split must have been fully synchronized
from its parent volume. This operation is illustrated in “Splitting Snapshots.”
Splitting Snapshots
Creating Multiple Snapshots
To make it easier to create snapshots of several volumes at the same time, both the
vxsnap make and vxassist snapshot commands accept more than one volume name
as their argument.
For traditional snapshots, you can create snapshots of all the volumes in a single disk
group by specifying the option -o allvols to the vxassist snapshot command.
By default, each replica volume is named SNAPnumber-volume, where number is a
unique serial number, and volume is the name of the volume for which a snapshot is being
taken. This default can be overridden by using the option -o name=pattern, as described
on the vxsnap(1M) and vxassist(1M) manual pages.
It is also possible to take several snapshots of the same volume. A new FastResync change
map is produced for each snapshot taken to minimize the resynchronization time for each
snapshot.
vxsnap split S1
Original
volume
V
Snapshot
volume of V:
S1
Snapshot
volume of S1:
S2
Original
volume
V
Volume
S1
Snapshot
volume of S1:
S2
S1 is independent S2 continues to be a
snapshot of S1