VERITAS Volume Manager 3.1 Administrator's Guide

Volume Tasks

Mirroring a Volume

Chapter 6 251

Backing Up Volumes Using Mirroring

If a volume is mirrored, backup can be done on that volume by taking

one of the volume mirrors ofﬂine for a period of time. This removes the

need for extra disk space for the purpose of backup only. However, it also

removes redundancy of the volume for the duration of the time needed

for the backup to take place.

NOTE The information in this section does not apply to RAID-5.

You can perform backup of a mirrored volume on an active system with

these steps:

Step 1. Optionally stop user activity for a short time to improve the consistency

of the backup.

Step 2. Dissociate one of the volume mirrors (vol01-01, for this example) using

the following command:

# vxplex dis vol01-01

Step 3. Create a new, temporary volume that uses the dissociated plex, using the

following command:

# vxmake -U gen vol tempvol plex=vol01-01

Step 4. Start the temporary volume, using the following command:

# vxvol start tempvol

Step 5. Perform appropriate backup procedures, using the temporary volume.

Step 6. Stop the temporary volume, using the following command:

# vxvol stop tempvol

Step 7. Dissociate the backup plex from its temporary volume, using the

following command:

# vxplex dis vol01-01

Step 8. Reassociate the backup plex with its original volume to regain

redundancy of the volume, using the following command:

# vxplex att vol01 vol01-01