Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Note: If the volume is part of a snapshot hierarchy, this command fails .
Upgrading existing volumes to use version 20 DCOs
You can upgrade a volume created before VxVM 4.0 to take advantage of new
features such as instant snapshots and DRL logs that are configured within the
DCO volume. You must upgrade the version of the disk groups, remove snapshots
and version 0 DCOs that are associated with volumes in the disk groups, and
configure 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 volumes to free up space in the disk group. You
can also add disk space by using the disk group move feature to bring in spare
disks from a different disk group.
See “Reorganizing the contents of disk groups” on page 227.
The vxsnap prepare command automatically enables FastResync on the volume
and on any snapshots that are generated from it.
If the volume is a RAID-5 volume, it is converted to a layered volume that can be
used with snapshots and FastResync.
Administering volumes
Upgrading existing volumes to use version 20 DCOs
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