Veritas Storage Foundation 5.1 SP1: Storage and Availability Management for Oracle (5900-1504, April 2011)

3
For a volume that has one or more associated snapshot volumes, use the
following command to reattach and resynchronize each snapshot:
# vxsnap [-g diskgroup] snapback snapvol
If persistent FastResync was enabled on the volume before the snapshot was
taken, the data in the snapshot plexes is quickly resynchronized from the
original volume. If persistent FastResync was not enabled, a full
resynchronization is performed.
4
Use the following command to turn off persistent FastResync for the volume:
# vxvol [-g diskgroup] set fastresync=off volume
5
Use the following command to dissociate a DCO object from an earlier version
of VxVM, DCO volume and snap objects from the volume:
# vxassist [-g diskgroup] remove log volume \
logtype=dco
6
Use the following command on the volume to upgrade it:
# vxsnap [-g diskgroup] prepare volume \
alloc="disk_name1,disk_name2"
Provide two disk names to avoid overlapping the storage of the snapshot DCO
plex with any other non-moving data or DCO plexes.
The vxsnap prepare command automatically enables persistent FastResync
on the volume and on any snapshots that are generated from it. It also
associates a DCO and DCO log volume with the volume to be snapshot.
7
To view the existing DCO plexes and see whether there are enough for the
existing data plexes, enter:
# vxprint -g diskgroup
There needs to be one DCO plex for each existing data plex.
8
If there are not enough DCO plexes for the existing data plexes, create more
DCO plexes:
# vxsnap [-g diskgroup] addmir dco_volume_name \
[alloc=disk_name]
where dco_volume_name is the name of the DCO volume you are creating.
Using Database FlashSnap for backup and off-host processing
Preparing hosts and storage for Database FlashSnap
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