Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

364 Configuring off-host processing
Implementing off-host processing solutions
linked break-off snapshot” on page 315. It is recommended that a snapshot disk
group is dedicated to maintaining only those disks that are used for off-host
processing.
4 On the primary host, link the snapshot volume in the snapshot disk group to the data
volume:
# vxsnap -g volumedg -b addmir volume mirvol=snapvol \
mirdg=snapvoldg
You can use the vxsnap snapwait command to wait for synchronization of the
linked snapshot volume to complete:
# vxsnap -g volumedg snapwait volume mirvol=snapvol \
mirdg=snapvoldg
Note: This step sets up the snapshot volumes, and starts tracking changes to the
original volumes. When you are ready to create a backup, proceed to step 5.
5 On the primary host, suspend updates to the volume that contains the database tables.
A database may have a hot backup mode that allows you to do this by temporarily
suspending writes to its tables.
6 Create the snapshot volume, snapvol, by running the following command on the
primary host:
# vxsnap -g volumedg make \
source=volume/snapvol=snapvol/snapdg=snapvoldg
If a database spans more than one volume, you can specify all the volumes and their
snapshot volumes using one command, as shown in this example:
# vxsnap -g dbasedg make \
source=vol1/snapvol=snapvol1/snapdg=sdg \
source=vol2/snapvol=snapvol2/snapdg=sdg \
source=vol3/snapvol=snapvol3/snapdg=sdg
7 On the primary host, if you temporarily suspended updates to a volume in step 5,
release all the database tables from hot backup mode.
8 On the primary host, deport the snapshot volume’s disk group using the following
command:
# vxdg deport snapvoldg
9 On the OHP host where the backup is to be performed, use the following command to
import the snapshot volume’s disk group:
# vxdg import snapvoldg
10 The snapshot volume is initially disabled following the join. Use the following
commands on the OHP host to recover and restart the snapshot volume:
# vxrecover -g snapvoldg -m snapvol
# vxvol -g snapvoldg start snapvol