Avoiding a partitioned cluster
When configuring enhanced concurrent volume groups in shared resource groups, ensure that multiple networks exist for communication between the nodes in the cluster, to avoid cluster partitioning.
When fast disk takeover is used, the normal SCSI reserve is not set to prevent multiple nodes from accessing the volume group.
In a partitioned cluster, it is possible that nodes in each partition could accidentally vary on the volume group in active state. Because active state varyon of the volume group allows file system mounts and changes to the physical volumes, this state can potentially lead to different copies of the same volume group. Make sure that you configure multiple communication paths between the nodes in the cluster.
Disk heart beat is strongly recommended for enhanced concurrent mode volume groups.