Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

To back up a volume in a private disk group
1
On the primary host, use the following command to see if the volume is
associated with a version 20 data change object (DCO) and DCO volume that
allow instant snapshots and Persistent FastResync to be used with the volume:
# vxprint -g volumedg -F%instant volume
If the volume can be used for instant snapshot operations, this command
returns on; otherwise, it returns off.
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, add a version 20
DCO and DCO volume.
See “Preparing a volume for DRL and instant snapshots” on page 359.
If the volume was created before release 4.0 of VxVM, and has any attached
snapshot plexes, or is associated with any snapshot volumes, upgrade the
volume to use a version 20 DCO.
See “Upgrading existing volumes to use version 20 DCOs” on page 366.
2
On the primary host, use the following command to check whether FastResync
is enabled on the volume:
# vxprint -g volumedg -F%fastresync volume
If FastResync is enabled, this command returns on; 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.
For more information about snapshots, see the Veritas Storage Foundation
Advanced Features Administrator's Guide.
It is recommended that a snapshot disk group is dedicated to maintaining
only those disks that are used for off-host processing.
Configuring off-host processing
Implemention of off-host processing solutions
396