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

Overview of Cluster Volume Management
352 VERITAS Volume Manager Administrator’s Guide
The following table summarizes the allowed and conflicting activation modes for shared
disk groups:
Shared disk groups can be automatically activated in any mode during disk group
creation or during manual or auto-import. To control auto-activation of shared disk
groups, the defaults file /etc/default/vxdg must be created.
The defaults file /etc/default/vxdg must contain the following lines:
enable_activation=true
default_activation_mode=activation-mode
The activation-mode is one of exclusive-write, read-only, shared-read,
shared-write, or off.
When a shared disk group is created or imported, it is activated in the specified mode.
When a node joins the cluster, all shared disk groups accessible from the node are
activated in the specified mode.
off The node has neither read nor write access to the disk group.
Query operations on the disk group are permitted.
Allowed and Conflicting Activation Modes
Disk group activated
in cluster as...
Attempt to activate disk group on another node as...
exclusive-
write
read-only shared-read shared-write
exclusive-write Fails Fails Succeeds Fails
read-only Fails Succeeds Succeeds Fails
shared-read Succeeds Succeeds Succeeds Succeeds
shared-write Fails Fails Succeeds Succeeds
Activation Modes for Shared Disk Groups