Queuing and clustering


Cloning appservers 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 WAS 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: