A clustered pair topology consists of two cluster nodes that operate under a single cluster administrative framework. In this configuration, failover occurs only between a pair. However, all nodes are connected by the cluster interconnect and operate under Oracle Solaris Cluster software control. You might use this topology to run a parallel database or a failover or scalable application on the pair.
The following figure illustrates a clustered pair configuration.
Figure 2-12 x86: Clustered Pair Topology