Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

109Administering instant snapshots
Creating instant snapshots
2 To create a linked break-off snapshot, use the following form of the vxsnap
make command.
# vxsnap [-g diskgroup ] make source= volume /snapvol= snapvol \
[/snapdg=
snapdiskgroup ]
The snapdg attribute must be used to specify the snapshot volume’s disk
group if this is different from that of the data volume.
For example, to use the prepared volume, prepsnap, as the snapshot for
the volume, vol1, in the disk group, mydg, use the following command:
# vxsnap -g mydg make \
source=vol1/snapvol=prepsnap/snapdg=mysnapdg
3 Use fsck (or some utility appropriate for the application running on the
volume) to clean the temporary volume’s contents. For example, you can use
this command with a VxFS file system:
# fsck -F vxfs /dev/vx/rdsk/ diskgroup / snapshot
4 If you require a backup of the data in the snapshot, use an appropriate
utility or operating system command to copy the contents of the snapshot to
tape, or to some other backup medium.
5 You now have the following choices of what to do with a linked break-off
snapshot:
■ Refresh the contents of the snapshot. This creates a new point-in-time
image of the original volume ready for another backup. If
synchronization was already in progress on the snapshot, this
operation may result in large portions of the snapshot having to be
resynchronized.
See “Refreshing an instant snapshot” on page 111.
Note: This operation is not possible if the linked volume and snapshot
are in different disk groups.
■ Relink the snapshot volume with the original volume.
See “Reattaching a linked break-off snapshot volume” on page 112.
■ Dissociate the snapshot volume entirely from the original volume. This
may be useful if you want to use the copy for other purposes such as
testing or report generation. If desired, you can delete the dissociated
volume.
See “Dissociating an instant snapshot” on page 114.
■ If the snapshot is part of a snapshot hierarchy, you can also choose to
split this hierarchy from its parent volumes.
See “Splitting an instant snapshot hierarchy” on page 115.