Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

■ To reduce the size of a disk group’s configuration database in the event that
its private region is nearly full. This is a much simpler solution than the
alternative of trying to grow the private region.
■ To perform online maintenance and upgrading of fault-tolerant systems that
can be split into separate hosts for this purpose, and then rejoined.
Use the vxdg command to reorganize your disk groups.
The vxdg command provides the following operations for reorganizing disk groups:
■ move moves a self-contained set of VxVM objects between imported disk groups.
This operation fails if it would remove all the disks from the source disk group.
Volume states are preserved across the move.
Figure 4-4 shows the move operation.
Figure 4-4
Disk group move operation
Source Disk Group
Move
After move
Target Disk Group
Source Disk Group Target Disk Group
■ split removes a self-contained set of VxVM objects from an imported disk
group, and moves them to a newly created target disk group. This operation
fails if it would remove all the disks from the source disk group, or if an
imported disk group exists with the same name as the target disk group. An
existing deported disk group is destroyed if it has the same name as the target
disk group (as is the case for the vxdg init command).
Figure 4-5 shows the split operation.
Creating and administering disk groups
Reorganizing the contents of disk groups
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