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

Chapter 9, Administering Volume Snapshots
Creating Instant Snapshots
283
Creating Multiple Instant Snapshots
To make it easier to create snapshots of several volumes at the same time, the vxsnap
make command accepts multiple tuples that define the source and snapshot volumes
names as their arguments. For example, to create three instant snapshots, each with the
same redundancy, from specified storage, the following form of the command can be
used:
# vxsnap [-g diskgroup] make source=vol1/snapvol=snapvol1\
source=vol2/snapvol=snapvol2 source=vol3/snapvol=snapvol3
The snapshot volumes (snapvol1, snapvol2 and so on) must have been prepared in advance
as described in “Creating a Volume for Use as a Full-Sized Instant Snapshot” on page 293.
The specified source volumes (vol1, vol2 and so on) may be the same volume or they can
be different volumes.
If all the snapshots are to be space-optimized and to share the same cache, the following
form of the command can be used:
# vxsnap [-g diskgroup] make \
source=vol1/newvol=snapvol1/cache=cacheobj \
source=vol2/newvol=snapvol2/cache=cacheobj \
source=vol3/newvol=snapvol3/cache=cacheobj \
[alloc=storage_attributes]
The vxsnap make command also allows the snapshots to be of different types, have
different redundancy, and be configured from different storage, as shown here:
# vxsnap [-g diskgroup] make source=vol1/snapvol=snapvol1 \
source=vol2[/newvol=snapvol2]/cache=cacheobj\
[/alloc=storage_attributes2][/nmirror=number2]
source=vol3[/newvol=snapvol3][/alloc=storage_attributes3]\
/nmirror=number3
In this example, snapvol1 is a full-sized snapshot that uses a prepared volume, snapvol2 is a
space-optimized snapshot that uses a prepared cache, and snapvol3 is a break-off full-sized
snapshot that is formed from plexes of the original volume.
An example of where you might want to create mixed types of snapshots at the same time
is when taking snapshots of volumes containing database redo logs and database tables:
# vxsnap -g mydg make \
source=logv1/newvol=snplogv1/drl=sequential/nmirror=1 \
source=logv2/newvol=snplogv2/drl=sequential/nmirror=1 \
source=datav1/newvol=snpdatav1/cache=mydgcobj/drl=on \
source=datav2/newvol=snpdatav2/cache=mydgcobj/drl=on