Warm standby configuration model

The warm standby topology consists of an application server environment that is supported by a secondary installation on a highly available shared disk.

In a warm standby topology, one instance of WebSphere® Application Server is active, in active-passive mode. Cluster management software, such as System Automation for Multiplatforms, allows failover to a secondary WebSphere Application Server installation on a shared disk.

The system environment consists of the following highly available components:
  • WebSphere Application Server and IBM® HTTP Server are automated to run on a primary server and a standby server, which is assisted by cluster management software. If the primary server fails, services can be restored by mounting the shared disk instance on the standby server and starting the services there. The application is accessed through a Service IP that is applied to the active system only.
  • The database server can be automated to run on a primary database server and a standby database server. Automation and data integrity is handled by DB2® HA Feature for LUW. If the primary database server fails, the services are automatically restored on the standby database server.
  • Tivoli® Directory Server can be automated to run on a primary server and a standby server. If the primary server fails, the standby server takes over the Tivoli Directory Server operations. The directory server manages data replication by using peer-to-peer replication. Cluster management software, such as System Automation for Multiplatforms, creates high availability without a proxy server.

The following diagram shows a warm standby topology, where a product such as Maximo® Asset Management is deployed in a scaled WebSphere Application Server environment.

Standby servers provide failover support for each component and shared disk storage maintains data integrity. As individual components, WebSphere Application Server, the HTTP server, the database server, and the directory server are all highly available.

The diagram is described in the main body of the text.


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