Load Balancing of the SAP Web AS for J2EE Applications 

Use

The purpose of load balancing is to distribute inbound requests optimally to the available resources.

Features

The SAP Web AS provides load balancing at various levels.

These are shown in the following graphic with (1) and (2) and described below.

·        Load Balancing Between Many SAP Web AS Instances (1)

You can also start a system with many J2EE dispatchers, for which the SAP Web Dispatcher or another load balancer is already activated as a Web switch.

This is described in the section Load Balancing Between Many J2EE Instances.

·        Load Balancing Within the SAP Web AS Instance (2)

In the J2EE Instance the J2EE Dispatcher distributes the incoming requests among the Server Processes it is connected to. When the first request arrives at the dispatcher for distribution, the dispatcher executes the load balancing function. Then the dispatcher can guarantee that subsequent requests will be distributed to the server process that is processing this session. For more information see:

Load Balancing by the J2EE Dispatcher

Load Balancing for J2EE Web Applications