Cluster and Load Balancing (AS-Java) 

Use

You can configure a software cluster version of several SAP NetWeaver Java instances to reduce downtime by installing additional dialog instances.

Clustering on instance level (where each instance is running on a separate hardware box) provides high availability for your system with protection from hardware problems. If a Java instance fails, the load balancing solution dispatches a client request to an available instance.

For more information about instance-level load balancing with the SAP Web Dispatcher, see Server Selection and Load Balancing Using the SAP Web Dispatcher (also relevant to AS-ABAP).

For more information on load balancing, see Load Balancing of the SAP Web AS for J2EE Applications.

In addition to process-level clustering, Java processes are started and controlled by the Java Startup and Control Framework. This detects failures of Java process and restarts them. For more information, see Architecture of the Java Startup and Control Framework.

Features

SAP NetWeaver Java has its own cluster architecture with a high level of scalability and availability.

For more information on Java cluster architecture for SAP NetWeaver, see Java Cluster Architecture.

Activities

The redundancy of the software cluster contributes high availability. In the event of application server failure, the system remains available.

 

SAP Web Dispatcher is a single point of failure, which you can protect with switchover software.