Enhanced concurrent mode

AIX® provides a new form of concurrent mode: enhanced concurrent mode. In enhanced concurrent mode, the instances of the Concurrent Logical Volume Manager (CLVM) coordinate changes between nodes through the Group Services component of the Reliable Scalable Cluster Technology (RSCT) facility in AIX. PowerHA® SystemMirror® automatically creates shared volume groups as enhanced concurrent mode, and converts existing shared volume groups to enhanced concurrent mode

Group Services protocols flow over the communications links between the cluster nodes. Any disk supported by PowerHA SystemMirror for attachment to multiple nodes can be included in an enhanced concurrent mode volume group.