1.4.4 Ring Configuration

The ring configuration allows for one primary and one backup server to be specified for each set of data services. The backup for a given data service is a node adjacent to the primary. All disk storage is dual-hosted and physically attached to exactly two cluster nodes. The nodes and storage are connected alternately, in a ring. All nodes can be actively running applications. Each node is both a primary for one set of data services and a backup for another set. Figure 1-14 shows a four-node ring configuration.

Figure 1-14 Ring Configuration

A restriction to the ring configuration is that you cannot run multiple RDBMS data services on the same node.