Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

To add a version 20 DCO object and DCO volume to an existing volume
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Ensure that the disk group containing the existing volume has been upgraded
to at least version 110. Use the following command to check the version of a
disk group:
# vxprint -l diskgroup | egrep 'version:'
To upgrade a disk group, use the following command:
# vxdg upgrade diskgroup
Setting up volumes for instant snapshots
Preparing a volume for instant snapshot operations
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