This section describes the EADs session failover functionality.

If you use this functionality, session information that is being executed in an application is stored on an EADs server. The stored session information is passed to another J2EE server when a failure occurs on a Web server or a J2EE server. As a result, when a failure occurs, even if a request is transferred to another J2EE server, you can continue operations in the state before failure.

For details on types, functionality differences, prerequisites, memory estimation, and precautions of the session failover functionality, see 5. Inheriting session information between J2EE servers.

The following table describes the organization of this chapter:

Table 7-1 Organization of this chapter (EADs session failover functionality)

Category	Title	Reference location
Description	Preparations for using the EADs session failover functionality	7.2
	Processing implemented in the EADs session failover functionality	7.3
Implementation	Definitions in cosminexus.xml	7.4
Setup	J2EE server settings	7.5
	Preparations for the EADs server	7.6
	Changing settings related to the EADs session failover functionality	7.7
Operation	Deleting data on the EADs server	7.8
	Procedures for the log analysis that uses the performance analysis trace	7.9
	Performing the log output of EADs operations	7.10

#

Precautions are described in the section 5.9 Precautions.