The sample topology

Our sample topology on the Windows 2000/AIX platform demonstrates the following key features: Web server caching, workload management, horizontally (for HTTP requests) Web container workload management, both horizontally and vertically (for handling servlet requests) EJB container workload management, both horizontally and vertically

Figure 7-1 explains the sample topology: A cluster of two Web servers hosts cluster.itso.ibm.com running the Load Balancer function, anticipated by a Caching Proxy, both from WebSphere Edge Components. A dedicated Deployment Manager machine managing the WAS cell, running IBM WAS Network Deployment V5.1. Within this cell, we have a WebSphere cluster with various appserver processes. WAS V5.1 is installed on both machines. A dedicated database server running IBM DB2 UDB V8.1.

Important: While this chapter describes how to configure a split JVM topology with the Web containers and EJB containers running in separate appservers, this is done so only for informational and demonstration purposes.

Recall the note from 3.3, Strategies for scalability that a negative performance impact will likely result when an application is deployed in this fashion. Better performance, scalability and failover is achieved when the Web components for an application are deployed in the same appserver as the EJB components.

Figure 7-1 The sample topology

Table 7-1 shows the names, functions, locations, and IP addresses of our systems. All machines are part of the same network. However, we choose different IP address ranges to distinguish between the DMZ network, the application network, and the back-end network.

Table 7-1
Name Network IP address Subnet mask Function
cproxy DMZ Network 10.20.10.101 255.255.0.0 Caching Proxy
lb DMZ Network 10.20.10.102 255.255.0.0 Load Balancer
web1 DMZ Network 10.20.10.103 255.255.0.0 Web Server 1
web2 DMZ Network 10.20.10.104 255.255.0.0 Web Server 2
dm Application Network 10.20.20.100 255.255.0.0 Deployment Manager
app1 Application Network 10.20.20.103 255.255.0.0 Application servers system 1
app2 Application Network 10.20.20.104 255.255.0.0 Application servers system 2
db Backend Network 10.20.30.100 255.255.0.0 Database server

Machines in the sample topology

Next Table 7-2, shows the properties of our Web server cluster.

Table 7-2
Name Network IP address Subnet mask Function
cluster DMZ Network 10.20.10.100 255.0.0.0 Web server cluster

Cluster in the sample topology

  Prev | Home | Next

 

WebSphere is a trademark of the IBM Corporation in the United States, other countries, or both.

 

IBM is a trademark of the IBM Corporation in the United States, other countries, or both.

 

AIX is a trademark of the IBM Corporation in the United States, other countries, or both.