Queuing and clustering considerations
Cloning application servers to create a cluster can be a valuable asset in configuring highly scalable production environments, especially when the application is experiencing bottlenecks that are preventing full CPU utilization of symmetric multiprocessing (SMP) servers.
When adjusting the WebSphere® Application Server system queues in clustered configurations, remember that when a server is added to a cluster, the server downstream receives twice the load.
Two servlet engines are located between a web server and a data source. It is assumed that the
web server, servlet engines and data source, but not the database, are all running on a single SMP
server. Given these constraints, the following queue considerations must be made: