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317Administering volume snapshots
Creating multiple snapshots
Figure 9-8 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.
Restoring the original volume from a snapshot
For traditional snapshots, the snapshot plex is resynchronized from the data in
the original volume during a
vxassist snapback operation. Alternatively, you
can choose the snapshot plex as the preferred copy of the data when performing
a snapback as illustrated in Figure 9-9. Specifying the option -o
resyncfromreplica to
vxassist resynchronizes the original volume from
the data in the 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