Sun GlassFish Enterprise Server 2.1 Deployment Planning Guide

Example Configuration

The following figure illustrates the separate tier topology.

Figure 3–3 Example Separate Tier Topology

Example Separate Tier Topology

In this topology, machine SYS0 hosts Enterprise Server instance A and machine SYS1 hosts Enterprise Server instance B. These two instances form a cluster that persists session information to the two DRUs:

All the nodes on a DRU are on different machines, so that even if one machine fails, the complete data for any DRU continues to be available on other machines.