DCO volume versioning

The internal layout of the DCO volume changed in VxVM 4.0 to support new features such as full-sized and space-optimized instant snapshots, and a unified DRL/DCO. Because the DCO volume layout is versioned, VxVM software continues to support the version 0 layout for legacy volumes. However, you must configure a volume to have a version 20 DCO volume if you want to take instant snapshots of the volume. Future releases of Veritas Volume Manager may introduce new versions of the DCO volume layout.

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Determining the DCO version number