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

Chapter 8, Administering Volumes

Preparing a Volume for DRL and Instant Snapshots

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Determining if DRL Logging is Active on a Volume

To determine if DRL logging is active on a mirrored volume:

1. Use the following vxprint commands to discover the name of the volume’s DCO

volume:

# DCONAME=‘vxprint [-g diskgroup] -F%dco_name volume‘

# DCOVOL=‘vxprint [-g diskgroup] -F%parent_vol $DCONAME‘

2. Use the vxprint command on the DCO volume to find out if DRL logging is active:

# vxprint [-g diskgroup] -F%drllogging $DCOVOL

This command returns on if DRL logging is enabled.

Disabling and Re-enabling DRL

To disable DRL (configured using a version 20 DCO volume) on a volume, enter the

following command:

# vxvol [-g diskgroup] set drl=off volume

To re-enable DRL on a volume, enter this command:

# vxvol [-g diskgroup] set drl=on volume

To re-enable sequential DRL on a volume, enter:

# vxvol [-g diskgroup] set drl=sequential volume

You can use these commands to change the DRL policy on a volume by first disabling and

then re-enabling DRL as required. DRL is automatically disabled if a data change map

(DCM, used with VERITAS Volume Replicator) is attached to a volume.

Removing Support for DRL and Instant Snapshots from a

Volume

To remove support for DRL and instant snapshot operation from a volume, use the

following command to remove the DCO and DCO volume that are associated with the

volume:

# vxsnap [-g diskgroup] unprepare volume

This command also has the effect of disabling FastResync tracking on the volume.

Note This command fails if the volume is part of a snapshot hierarchy.