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

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 can perform
the join from a master node or a slave node. If you run the command to perform
the join on a slave node, the command is shipped to the master and executed on
the master.
See “Joining disk groups” on page 262.
Changing the activation mode on a shared disk group
The activation mode for access by a cluster node to a shared disk group is set
directly 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 exclusivewrite or ew, readonly or ro, sharedread
or sr, sharedwrite or sw, or off.
If you use this command to change the activation mode of a shared disk group,
you must first change the activation mode to off before setting it to any other
value, as shown here:
# vxdg -g myshdg set activation=off
# vxdg -g myshdg set activation=readonly
See “Activation modes of shared disk groups” on page 429.
Setting the disk detach policy on a shared disk group
The vxdg command may be used to set either the global or local disk detach
policy for a shared disk group:
# vxdg -g diskgroup set diskdetpolicy=global|local
The default disk detach policy is global.
Setting the disk group failure policy on a shared disk group
The vxdg command may be used to set either the dgdisable or leave failure policy
for a shared disk group:
Administering cluster functionality (CVM)
Administering VxVM in cluster environments
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