Before you begin
You must migrate prerequisite and corequisite programs to the levels required by WebSphere Application Server, Version 5. You must also identify ports in use in Version 3.5.x before you begin the Version 5 installation, to avoid possible conflicts during coexistence. The first two steps in this task describe these activities.
Why and when to perform this task
You can install WebSphere Application Server Version 3.5.5 (and later) and Version 5 on the same node. When the Version 5 installation wizard detects the Version 3.5.x installation, it displays the migration and coexistence panel, where you can select either option, or neither option. If you select coexistence, the installation wizard displays the port number panel, to ensure you install Version 5 without port conflicts.
Silent installation also supports configuring for coexistence silently. You can specify non-conflicting port assignments in the options response file.
By default, there are port conflicts between Version 3.5.x and Version 5 that you must resolve. Also, if you migrate more than two Version 3.5.5 nodes to Version 5, there are port conflicts that you must resolve, as described in the Setting up Version 5 coexistence topic.
Steps for this task
Refer to the
WebSphere Application Server detailed system
requirements
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27006921
site for current requirements.
Refer to the Port number settings in WebSphere Application Server versions topic to see a list of default port numbers, and where they are defined.
Inspect the configuration of the Version 3.5.x product, either WebSphere Application Server Advanced Edition, or WebSphere Application Server Standard Edition.
If necessary, use the following command to examine existing node and port settings when the administrative server is running.
xmlConfig -export config.xml -nodeName theNodeName
Review the output xml file to look for <node action="update" name="nodename"> to determine the node name. You can also find port number assignments in the output.xml file. The installation wizard displays a default set of coexistence port numbers as suggested Version 5 port numbers. Change the values to ports that are not in use. The installation wizard uses whatever values you approve.
Change conflicting HTTP transport ports manually, if necessary. See Changing HTTP transport ports.
Upgrade the Web server to the common level supported by both versions of the Application Server.
Prepare the same Web server to support both Application Server versions:
For example, installing WebSphere Application Server, Version 5 updates the system variable PATH, potentially affecting tools with the same name across installations. To run tools with conflicting names, alter the PATH environment variable in a command window and place the directory for the former installation before the directory for the latter installation. For example, PATH=E:\WebSphere\AppServer\35\bin;%PATH%. Then, invoke the tools from the bin directory.
What to do next
Return to Migrating and coexisting to continue.