This subsection describes the configuration in which the executing node and the standby node of Application Server are in 1-to-1 ratio and the respective Application Server instances are standby for each other while being operated as the executing node. This configuration is called a mutual standby configuration. Note that the system structured with this configuration is called a mutual node switching system.
This is one of the configurations in which one Application Server machine in the standby node is prepared for one Application Server machine in the executing node. However, a different J2EE server is operated as the executing node instead of stopping the Application Server in the standby node. This is called mutual standby..
When you deploy a J2EE server of the same type on each Application Server machine and start a different J2EE server, the respective Application Server instances operate as an active node and a standby node for each other. If an error occurs on any of the machines, the nodes are switched and processes of both J2EE servers are executed on the other Application Server machine.
The prerequisites of this configuration are as follows:
Management Server is deployed one by one on the same machine as Application Server and is started on both the hosts. The respective Management Server manages different management domains. The scope of the respective management domains is within the Application Server machine where Management Server is deployed.
The following figure shows an example of the mutual node switching system. In this example, the transaction service is used. The shared disk is required when you use the transaction service.
Figure 3-57 Example of the configuration of mutual node switching system (for using transaction service)
Note: For other legend items, see 3.2 Description of the system configuration.
This subsection describes the required software and processes of the respective machines.
You must install Application Server on the Application Server machine.
The processes that must be started on the application server machine in a mutual node switching system are as follows:
The other required software and processes of Application Server differ for each system configuration according to the used functions. Deploy the required software and processes as per the used functions.
Start the process of virtual host 1 only for node switching.
The configuration of the software and processes to be installed on the Application Server machine in the standby node should be executing node1/standby node 2.
For the node switching of processes, start the process of virtual host 2 only.
Install the following software on the client machine: