Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Implementing Off-Host Processing Solutions
322 VERITAS Volume Manager Administrator’s Guide
15. On the primary host, re-import the snapshot volume’s disk group using the following
command:
# vxdg import snapvoldg
16. On the primary host, use the following command to rejoin the snapshot volume’s disk
group with the original volume’s disk group:
# vxdg join snapvoldg volumedg
17. The snapshot volume is initially disabled following the join. Use the following
commands on the primary host to recover and restart the snapshot volume:
# vxrecover -g volumedg -m snapvol
# vxvol -g volumedg start snapvol
The contents of the snapshot volume are now ready to be refreshed.
Repeat steps 5 through 17 each time that you need to back up the volume.
Implementing Decision Support
This section describes a procedure for implementing off-host decision support for a
volume in a private disk group. The intention is to present an outline of how to set up a
replica database by combining the Persistent FastResync and disk group split and join
features of VxVM. It is beyond the scope of this guide to describe how to configure a
database to use this procedure.
To set up a replica database using the table files that are configured within a volume in a
private disk group, use the following procedure.
1. Use the following command on the primary host 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
This command returns on if the volume can be used for instant snapshot operations;
otherwise, it returns off.