After setting up the HTTP plug-in for load balancing in a clustered IBM WebSphere environment, the request load is not evenly distributed among back-end WebSphere Application Servers.
In most cases, the preceding behavior is observed because of a misunderstanding of how HTTP plug-in load balancing algorithms work or might be due to an improper configuration. Also, the type of Web server (multi-threaded versus single threaded) being used can effect this behavior.
Resolving the problem
The following document is designed to assist you in understanding how HTTP plug-in load balancing works along with providing you some helpful tuning parameters and suggestions to better maximize the ability of the HTTP plug-in to distribute load evenly.