Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

If bootdg is specified as the argument to this command, the default disk group is
set to be the same as the currently defined system-wide boot disk group.
If nodg is specified as the argument to the vxdctl defaultdg command, the
default disk group is undefined.
The specified disk group is not required to exist on the system.
See the vxdctl(1M) manual page.
See the vxdg(1M) manual page.
Disk group versions
All disk groups have a version number associated with them. Each major Veritas
Volume Manager (VxVM) release introduces a disk group version. To support the
new features in the release, the disk group must be the latest disk group version.
By default, VxVM creates disk groups with the latest disk group version. For
example, Veritas Volume Manager 5.1SP1 creates disk groups with version 160.
Each VxVM release supports a specific set of disk group versions. VxVM can
import and perform operations on a disk group of any supported version. However,
the operations are limited by what features and operations the disk group version
supports. If you import a disk group from a previous version, the latest features
may not be available. If you attempt to use a feature from a newer version of
VxVM, you receive an error message similar to this:
VxVM vxedit ERROR V-5-1-2829 Disk group version doesn't support
feature
You must explicitly upgrade the disk group to the appropriate disk group version
to use the feature.
See “Upgrading the disk group version” on page 264.
Table 6-1 summarizes the Veritas Volume Manager releases that introduce and
support specific disk group versions. It also summarizes the features that are
supported by each disk group version.
Creating and administering disk groups
About disk groups
212