WebSphere V3.5 Handbook

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16.5. Horizontally scaling Web servers with WebSphere

Figure 631. WebSphere with Network Dispatcher

Adding a mechanism for distributing HTTP requests, such as the Network Dispatcher component of WebSphere Edge Server as depicted above, provides the following advantages:

Network Dispatcher allows for increased number of connected users.
Network Dispatcher eliminates the HTTP Server as a single point of failure and can be used in combination with WebSphere WLM to eliminate the application server as a single point of failure.
Increased throughput by virtue of adding multiple servers and CPUs to servicing the workload.

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