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403Administering cluster functionality
Overview of cluster volume management
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 exclusivewrite, readonly, sharedread,
sharedwrite, 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.
sharedwrite (sw) The node has write access to the disk group. Attempts to
activate the disk group for shared read and shared write
access succeed. Attempts to activate the disk group for
exclusive write and read-only access fail.
off The node has neither read nor write access to the disk
group. Query operations on the disk group are permitted.
Table 13-2 Allowed and conflicting activation modes
Disk group
activated in cluster
as...
Attempt to activate disk group on another node as...
exclusive-
write
readonly sharedread sharedwrite
exclusivewrite
Fails Fails Succeeds Fails
readonly
Fails Succeeds Succeeds Fails
sharedread
Succeeds Succeeds Succeeds Succeeds
sharedwrite
Fails Fails Succeeds Succeeds
Table 13-1 Activation modes for shared disk groups
Activation mode Description