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

■ Use the default disk group name that is specified by the environment variable
VXVM_DEFAULTDG. This variable can also be set to one of the reserved
system-wide disk group names: bootdg, defaultdg, or nodg. If the variable is
undefined, the following rule is applied.
■ Use the disk group that has been assigned to the system-wide default disk
group alias, defaultdg. If this alias is undefined, the following rule is applied.
See “Displaying and specifying the system-wide default disk group” on page 211.
■ If the operation can be performed without requiring a disk group name (for
example, an edit operation on disk access records), do so.
If none of these rules succeeds, the requested operation fails.
Warning: In releases of VxVM prior to 4.0, a subset of commands tried to determine
the disk group by searching for the object name that was being operated upon by
a command. This functionality is no longer supported. Scripts that rely on
determining the disk group from an object name may fail.
Displaying the system-wide boot disk group
To display the currently defined system-wide boot disk group, use the following
command:
# vxdg bootdg
See the vxdg(1M) manual page.
Displaying and specifying the system-wide default disk group
To display the currently defined system-wide default disk group, use the following
command:
# vxdg defaultdg
If a default disk group has not been defined, nodg is displayed. You can also use
the following command to display the default disk group:
# vxprint -Gng defaultdg 2>/dev/null
In this case, if there is no default disk group, nothing is displayed.
Use the following command to specify the name of the disk group that is aliased
by defaultdg:
# vxdctl defaultdg diskgroup
211Creating and administering disk groups
About disk groups