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

Chapter 1, Understanding VERITAS Volume Manager
FastResync
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Associated with both the original volume and the snapshot volume are snap objects. The
snap object for the original volume points to the snapshot volume, and the snap object for
the snapshot volume points to the original volume. This allows VxVM to track the
relationship between volumes and their snapshots even if they are moved into different
disk groups.
The snap objects in the original volume and snapshot volume are automatically deleted in
the following circumstances:
◆ For traditional snapshots, the vxassist snapback operation is run to return all of
the plexes of the snapshot volume to the original volume.
◆ For traditional snapshots, the vxassist snapclear operation is run on a volume to
break the association between the original volume and the snapshot volume. If the
volumes are in different disk groups, the command must be run separately on each
volume.
◆ For full-sized instant snapshots, the vxsnap reattach operation is run to return all
of the plexes of the snapshot volume to the original volume.
◆ For full-sized instant snapshots, the vxsnap dis or vxsnap split operations are
run on a volume to break the association between the original volume and the
snapshot volume. If the volumes are in different disk groups, the command must be
run separately on each volume.
Note The vxsnap reattach, dis and split operations are not supported for instant
space-optimized snapshots.
See “Administering Volume Snapshots” on page 261, and the vxsnap(1M) and
vxassist(1M) manual pages for more information.