HP Veritas Volume Manager 5.0 -UX 11i v3 manual Upgrading existing volumes to use version 20 DCOs

Administering volumes

Upgrading existing volumes to use version 20 DCOs

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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.

Upgrading existing volumes to use version 20 DCOs

The procedure described in this section describes how to upgrade a volume created before VxVM 4.0 so that it can take advantage of new features such as instant snapshots, and DRL logs that are configured within the DCO volume. This requires upgrading the version of the disk groups, removing any existing snapshots and version 0 DCOs that are associated with volumes in the disk groups, and finally configuring the volumes with version 20 DCOs.

Note: The plexes of the DCO volume require persistent storage space on disk to be available. To make room for the DCO plexes, you may need to add extra disks to the disk group, or reconfigure existing volumes to free up space in the disk group. Another way to add disk space is to use the disk group move feature to bring in spare disks from a different disk group. For more information, see “Reorganizing the contents of disk groups” on page 195.

To upgrade an existing disk group and the volumes that it contains

1Upgrade the disk group that contains the volume to the latest version before performing the remainder of the procedure described in this section. Use the following command to check the version of a disk group: