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This website gives good implementation of tomcat server in windows as well in linux machine. Tomcat clustering is difficult thing to do. When you try to do session maintainence . I dont understand how to implement clustering with session easily. If anyone know it explain it

After a lot of load tests, I found much more faster the HttpNioConnector, receveing http calls from mod_proxy instead of mod_jk.
HttpNioConnector is java NIO based so you may exploit the tomcat comet feature (async http handling of requests).
NB.: Don't forget to implement HttpSessionActivationListener on your session custom object, otherwise the attributes replication doesn't work.