Failover is another high-availability strategy that allows a secondary node to take over in the event of a fault or failure in the first node, thus allowing normal use to continue. Automatic failover is a default behaviour of the cluster; it does not require manual intervention.
Failover supports the Unwired Platform data tier, which includes the consolidated database, cluster database, messaging database, 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 becomes active). Consequently, administrators must ensure that their data storage is protected via a redundant array of independent disks (RAID) cluster.