Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

vol-03 dg1 plex detmir vol dg1 - 20M (0.2%) -
mvol2 dg2 vol detvol vol dg1 - 20M (0.2%) -
This shows that the volume vol has three full-sized snapshots, svol1, svol2 and
svol3, which are of types full-sized instant (fullinst), mirror break-off (mirbrk)
and linked break-off (volbrk). It also has one snapshot plex (snapmir), vol-02,
and one linked mirror volume (mirvol), mvol. The snapshot svol2 itself has a
space-optimized instant snapshot (spaceopt), svol21. There is also a volume set,
vset1, with component volumes v1 and v2. This volume set has a mirror break-off
snapshot, svset1, with component volumes sv1 and sv2. The last two entries
show a detached plex, vol-03, and a detached mirror volume, mvol2, which have
vol as their parent volume. These snapshot objects may have become detached
due to an I/O error, or, in the case of the plex, by running the vxplex det
command.
The CHANGE_DATA column shows the approximate difference between the current
contents of the snapshot and its parent volume. This corresponds to the amount
of data that would have to be resynchronized to make the contents the same again.
The SYNCED_DATA column shows the approximate progress of synchronization
since the snapshot was taken.
The -l option can be used to obtain a longer form of the output listing instead of
the tabular form.
The -x option expands the output to include the component volumes of volume
sets.
See the vxsnap(1M) manual page for more information about using the vxsnap
print and vxsnap list commands.
Controlling instant snapshot synchronization
Synchronization of the contents of a snapshot with its original volume is not
possible for space-optimized instant snapshots.
By default, synchronization is enabled for the vxsnap reattach, refresh and
restore operations on instant snapshots. Otherwise, synchronization is disabled
unless you specify the syncing=yes attribute to the vxsnap command.
Table 17-1 shows the commands that are provided for controlling the
synchronization manually.
239Administering volume snapshots
Creating instant snapshots