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The vxfen driver connects to GAB port b to intercept cluster membership changes (reconfiguration messages). During a membership change, the fencing driver determines which systems are members of the cluster to allow access to shared disks.
After completing fencing operations, the driver passes reconfiguration messages to higher modules. CVM handles fencing of data drives for shared disk groups. After a node successfully joins the GAB cluster and the driver determines that a preexisting split brain does not exist, CVM can import all shared disk groups. The CVM master coordinates the order of import and the key for each disk group. As each slave joins the cluster, it accepts the CVM list of disk groups and keys, and adds its proper digit to the first byte of the key. Each slave then registers the keys with all drives in the disk groups.