Active/active failover configurations

In an active/active failover configuration, two or more database nodes are clustered together to provide a common service to applications.

Unlike active/passive failover configurations, all nodes of an active/active failover configuration are actively processing transactions. If a node fails, the remaining nodes continue to provide the service. The following figure illustrates this concept:

Two flow charts. The first depicts a disk subsystem under normal operations, and the second depicts a subsystem after a failover, where one is database node is offline, while the other three remain running.