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372 Configuring off-host processing
Implementing off-host processing solutions
Note: If the volume was created under VxVM 4.0 or a later release, and it is
not associated with a new-style DCO object and DCO volume, follow the
procedure described in “Preparing a volume for DRL and instant snapshots”
on page 275.
If the volume was created before release 4.0 of VxVM, and has any attached
snapshot plexes, or is associated with any snapshot volumes, follow the
procedure given in “Upgrading existing volumes to use version 20 DCOs” on
page 279.
2 Use the following command on the primary host to check whether
FastResync is enabled on the volume:
# vxprint -g volumedg -F%fastresync volume
This command returns on if FastResync is enabled; otherwise, it returns
off.
If FastResync is disabled, enable it using the following command on the
primary host:
# vxvol -g volumedg set fastresync=on volume
3 On the primary host, create a new volume in a separate disk group for use as
the snapshot volume as described in “Creating a volume for use as a full-
sized instant or linked break-off snapshot” on page 323. 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. 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