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

Upgrading Existing Volumes to Use Version 20 DCOs
240 VERITAS Volume Manager Administrator’s Guide
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 155.
Perform the following steps to upgrade an existing disk group and the volumes that it
contains:
1. Upgrade 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:
# vxdg list diskgroup
To upgrade a disk group to the latest version, use the following command:
# vxdg upgrade diskgroup
For more information, see “Upgrading a Disk Group” on page 169.
2. Use the following command to discover which volumes in the disk group have
version 0 DCOs associated with them:
# vxprint [-g diskgroup] -F “%name” -e “v_hasdcolog”
Note This command assumes that the volumes can only have version 0 DCOs as the
disk group has just been upgraded. See “Determining the DCO Version
Number” on page 238 for a description of how to find out the DCO version
number of a volume in any disk group.