Device Group Failover

Because a disk enclosure is connected to more than one cluster node, all device groups in that enclosure are accessible through an alternate path if the node currently mastering the device group fails. The failure of the node that is mastering the device group does not affect access to the device group except for the time it takes to perform the recovery and consistency checks. During this time, all requests are blocked (transparently to the application) until the system makes the device group available.

Figure 3-1  Device Group Before and After Failover