HADB (used for high availability session storage) works with Application Server to provide failover capabilities that include session persistence.
If you are using these components with Sun Cluster software, you must perform a precise series of tasks before installing any Java ES components. Refer to Sun Cluster Software Example to see Sun Cluster guidelines.
This example provides guidelines for implementing a two-node HADB cluster with load balancing. However, a preferred solution is to install HADB on four hosts with nothing else installed on them. The domain administration server (DAS) with a copy of HADB for administration and a load balancer and Web Server would be installed on a separate machine.
On a partitioned operating system, a preferred solution is that two servers be installed (either host or zone) with at least one HADB process running on each.
Application Server requires a local copy of Message Queue. Application Server and HADB must be on the same host so you can use the integrated management tools provided by Application Server. The Load Balancing Plugin subcomponent of Application Server requires a web server. This example uses the Java ES Web Server as the container.
The general tasks include:
Installing the Java ES components
Starting the servers
Configuring load balancing
You can use the following guidelines to install all components on a node or zone. On subsequent nodes, install the components required by your deployment. A minimum of two installation sessions are required.
The following high-level tasks are required:
Verifying that the hardware is connected correctly for your cluster
Running the Java ES installer
At component selection, choosing Application Server and High Availability Session Store
Message Queue and all the subcomponents of Application Server except the Application Server Node Agent and Load Balancing Plugin are automatically selected.
Expanding the Application Server component and selecting Load Balancing Plugin.
You must install Web Server and Load Balancing Plug-in using the same access permissions.
The installer verifies software on your host and provides guidance if incompatibilities are identified.
Selecting the Configure Now option
Message Queue requires no configuration.
The configuration pages are displayed for components that can be configured during installation. Gather your configuration information from the table in HADB Configuration Information in Sun Java Enterprise System 2005Q4 Installation Reference.
Running the installation
Viewing the Installation Summary and Log
Starting the components:
Completing HADB postinstallation configuration
Completing load balancing configuration