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

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 456.
Setting the disk detach policy on a shared disk group
The disk detach policy for a shared disk group can only be set on the master node.
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.
See “Connectivity policy of shared disk groups” on page 458.
Setting the disk group failure policy on a shared disk group
The disk group failure policy for a shared disk group can only be set on the master
node.
The vxdg command may be used to set either the dgdisable or leave failure policy
for a shared disk group:
# vxdg -g diskgroup set dgfailpolicy=dgdisable|leave
The default failure policy is dgdisable.
See “Disk group failure policy” on page 461.
Creating volumes with exclusive open access by a node
All shared volumes, including those with exclusive open access, can only be created
on the master node.
When using the vxassist command to create a volume, you can use the
exclusive=on attribute to specify that the volume may only be opened by one
node in the cluster at a time. For example, to create the mirrored volume volmir
Administering cluster functionality
Administering VxVM in cluster environments
482