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 4.0.1 before you begin the installation, to avoid possible conflicts during coexistence.
You can install WebSphere Application Server Version 4.0.1, with a minimum Service level of W401502, and Version 5 on the same node. IBM recommends that you keep the service level current.
Why and when to perform this task
By default, there are port conflicts between Version 4.0.1 and Version 5 that you must resolve. See Migrating from V4.0.1 for more information. The next step is to setup the Webserver to support V4.0.1 and V5 coexistence.
Steps for this task
To use the same Web server for both Application Server versions, you must first upgrade the Web server to the common level supported by both versions of the application server.
Follow this procedure to use the same Web server for both WebSphere Application Server versions.
If you have both Version 4.0.1 Samples and Version 5 Samples in the file, you can access only the Version 5 Samples after merging the configuration files because there is one context root for Samples.
This is described in the Preparing to install and configure a Web server (tins_webserver) topic in the base Application Server information center.
Whenever you modify the plugin-cfg.xml file for either version, you must manually merge the files again, to make a master file.
This is described in the Preparing to install and configure a Web server (tins_webserver) topic in the base Application Server information center.
Whenever you modify the plugin-cfg.xml file for either version, you must manually merge the files again, to make a master file.
What to do next
Return to Migrating and coexisting to continue.