Load Balancing of the SAP Web AS for Java Applications 

Use

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

Features

The SAP Web Application Server provides load balancing at various levels.

These are shown as (1) and (2) in the graphic below.

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

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

This is described in Load Balancing Between Many Java Instances.

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

In the J2EE Instance the Java Dispatcher distributes the inbound requests to the Server Processes, to which it is connected. The J2EE dispatcher runs the load balancing when the first session request arrives. The dispatcher ensures that subsequent requests get to the server process that is processing this session. For more information see the following sections:

Load Balancing by the Java Dispatcher

Load Balancing for J2EE Web Applications

Registering Server Processes for HTTP Load Balancing