Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Administering VxVM in Cluster Environments
376 VERITAS Volume Manager Administrator’s Guide
Splitting Disk Groups
As described in “Splitting Disk Groups” on page 165, you can use the vxdg split
command to remove a self-contained set of VxVM objects from an imported disk group,
and move them to a newly created disk group.
Splitting a private disk group creates a private disk group, and splitting a shared disk
group creates a shared disk group. You can split a private disk group on any cluster node
where that disk group is imported. You can only split a shared disk group or create a
shared target disk group on the master node.
For a description of the other options, see “Moving Objects Between Disk Groups” on
page 163.
Joining Disk Groups
As described in “Joining Disk Groups” on page 166, you can use the vxdg join
command to merge the contents of two imported disk groups. In a cluster, you can join
two private disk groups on any cluster node where those disk groups are imported.
If the source disk group and the target disk group are both shared, you must perform the
join on the master node.
Note You cannot join a private disk group and a shared disk group.
Changing the Activation Mode on a Shared Disk Group
Note The activation mode for access by a cluster node to a shared disk group is set on that
node.
The activation mode of a shared disk group can be changed using the following
command:
# vxdg -g diskgroup set activation=mode
The activation mode is one of exclusive-write or ew, read-only or ro,
shared-read or sr, shared-write or sw, or off. See “Activation Modes of Shared
Disk Groups” on page 351 for more information.