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

Determining if DRL logging is active on a volume

To determine if DRL logging (configured using a version 20 DCO) is active on a

mirrored volume

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`

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) on a volume, enter the

following:

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

To re-enable DRL on a volume, enter the following:

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

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

# 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. If a data change map (DCM, used

with Veritas Volume Replicator) is attached to a volume, DRL is automatically

disabled .

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.

Administering volumes

Preparing a volume for DRL and instant snapshots

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