IBM WebSphere: Deployment and Advanced Configuration

Topology Patterns on the Edge

Now that we have discussed the Load Balancer and Caching Proxy separately in simple scenarios, let's conclude by looking at a more typical configuration. Figure 23-16 shows Edge Components in the DMZ, with scalability and failover now at each tier, as opposed to the simple, non-Edge topology we saw at the start of this chapter. We have a pair of active/standby load balancers in the DMZ serving to a pair of proxy servers. The proxy servers then send requests through to the backend “secure” zone, to our HTTP servers. Those HTTP servers are using the WAS plug-in file, which has workload management features to balance load across a tier of WAS application servers. We have redundancy at each layer of the system. However, ...