Failover is another high-availability strategy that allows a secondary server to take over in the event of a fault or failure in the first server, thus allowing normal use to continue. Automatic failover is a default behaviour of the cluster; it does not require manual intervention or configuration.
Failover primarily supports the Unwired Platform data tier, which includes consolidated database, the cluster database, and the messaging and monitoring database.
Fault-tolerance of the data tier through failover uses a passive/active node configuration where only one node is active at any given moment (that is, if one node fails another standby node then becomes active). Consequently, administrators must ensure that their data storage is protected via a redundant array of independent disks (RAID) cluster.