If one has lots of memory and CPU, they could run multiple (20 x 1Gb VM) Tomcat instances on a single host and cluster them behind a load balancer. Each Tomcat requires a few ports allocated to it through the server.xml file, but they can be set via environment variables so can be started as follows:
export -Dtomcat.http=8080 -Dtomcat.manager=8081; tomcat/bin/startup.sh & export -Dtomcat.http=8090 -Dtomcat.manager=8091; tomcat/bin/startup.sh & etc However, this raises a point that is worth discussing. Mid Tier does not, the last time I checked, distribute sessions - ie the sticky flag has to be set. The problem with this approach is when a Tomcat dies (because Mid Tier has died), the traffic for that user can not be diverted to another one. Session replicate is easy: Ensure everything that goes into the session is serializable. We recently performed the same surgery to SSO Plugin so it would replicate sessions for non-BMC platforms. John -- SSO Plugin for the BMC platform http://www.javasystemsolutions.com _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org attend wwrug12 www.wwrug12.com ARSList: "Where the Answers Are"
