VERITAS Storage Foundation 4.1 Oracle Administrator's Guide

Preparing Hosts and Storage for Database FlashSnap Prerelease 8 September 2005, 8:55am
210 VERITAS Storage Foundation for Oracle Administrator’s Guide
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.
Note 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.
9. If the plex is in a SNAPDONE state, convert it to an ACTIVE state:
# vxplex [-g diskgroup] convert state=ACTIVE data_plex
10. Convert the data plexes to a SNAPDONE state and associate a DCO plex with the data plex that
will be used for snapshot operations:
# vxplex [-g diskgroup] -o dcoplex=dco_plex_name convert \
state=SNAPDONE data_plex
where dco_plex_name is the name of the DCO plex you are creating.