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

Chapter 9, Administering Volume Snapshots
Creating Traditional Third-Mirror Break-Off Snapshots
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Here the DCO plex trivol_dco_03 is specified as the DCO plex for the new snapshot
plex.
To convert an existing plex into a snapshot plex in the SNAPDONE state for a volume on
which Non-Persistent FastResync is enabled, use the following command:
# vxplex [-g diskgroup] convert state=SNAPDONE plex
A converted plex is in the SNAPDONE state, and can be used immediately to create a
snapshot volume.
Note The last complete regular plex in a volume, an incomplete regular plex, or a dirty
region logging (DRL) log plex cannot be converted into a snapshot plex.
Creating Multiple Snapshots
To make it easier to create snapshots of several volumes at the same time, the snapshot
option accepts more than one volume name as its argument, for example:
# vxassist [-g diskgroup] snapshot volume1 volume2 ...
By default, the first snapshot volume is named SNAP-volume, and each subsequent
snapshot is named SNAPnumber-volume, where number is a unique serial number, and
volume is the name of the volume for which the snapshot is being taken. This default
pattern can be overridden by using the option -o name=pattern, as described on the
vxassist(1M) manual page. For example, the pattern SNAP%v-%d reverses the order of
the number and volume components in the name.
To snapshot all the volumes in a single disk group, specify the option -o allvols to
vxassist:
# vxassist -g diskgroup -o allvols snapshot
This operation requires that all snapstart operations are complete on the volumes. It
fails if any of the volumes in the disk group do not have a complete snapshot plex in the
SNAPDONE state.