VERITAS Volume Manager 4.1 Administrator's Guide

Conﬁguring Off-Host Processing

Implementing Off-Host Processing Solutions

Chapter 11390

Step 12. On the OHP host, use the following command to deport the snapshot

volume’s disk group:

# vxdg deport snapvoldg

Step 13. On the primary host, re-import the snapshot volume’s disk group using

the following command:

# vxdg import snapvoldg

Step 14. 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

Step 15. 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

Step 16. On the primary host, reattach the plexes of the snapshot volume to the

original volume, and resynchronize their contents using the following

command:

# vxassist -g volumedg -o allplexes snapback snapvol

Repeat steps 4 through 16 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.

Step 1. Use the following command on the primary host to see if the volume is

associated with a data change object (DCO) and DCO volume that allow

Persistent FastResync to be used with the volume: