Sun Java System Web Server 7.0 Update 4 Administrator's Guide

Session Replication and Failover Operation

This section describes the session replication operation in detail.

At the end of a web request, the Web Server determines whether the session data needs to be copied through the session replication configuration that is stored in the server configuration file, the server.xml.

Consider a use case of four instances forming a cluster with session replication enabled on the Administration Server.

The session replication process in a Web Server cluster of four instances (A, B, C, and D) running on four nodes is as follows:

The failover process in a Web Server clustered environmentis as follows:

Web Server 7.0 does not support the following features in session replication: