Migrating and coexisting application servers

Migrating involves collecting the configuration information from a previous release of a WebSphere® Application Server and merging it into a configuration for a new release. Coexisting involves running a new release of a WebSphere Application Server and an earlier release simultaneously on the same machine.

Before you begin

Supported configurations Supported configurations:

This article is about configuration migration, such as migrating deployment managers and federated nodes in a network deployment environment. The Application Migration Toolkit for WebSphere Application Server provides support for migrating applications from previous versions of WebSphere Application Server to the latest product version. For information about migrating applications, read more about the Application Migration Toolkit.

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Read Overview of migration, coexistence, and interoperability and Premigration considerations. For resources to help you plan and perform your migration, visit Knowledge Collection: Migration planning for WebSphere Application Server.

The migration tools basically save the existing WebSphere configurations and user applications in a backup directory and then process the contents of this backup directory to migrate the configurations and your applications from previous WebSphere Application Server releases to the latest release.

If you have a previous version of WebSphere Application Server, you must decide whether to migrate the configuration and applications of the previous version to the new version.

Migration does not uninstall the previous version.
  • For stand-alone application server migrations and for deployment-manager migrations in which you do not choose to disable the previous deployment manager during migration, the earlier release is still functional.
  • For federated-node migrations and for deployment-manager migrations in which you do choose to disable the previous deployment manager during migration, the earlier release is disabled after migration completes successfully. You can re-enable the earlier version using the migrationDisablementReversal.jacl script.

If you run two different versions of the application server at the same time, the two versions are coexisting. For example, if Version 6.1 and 8.5 application servers are running on the same machine, they are coexisting.

For help in troubleshooting problems when migrating, read Troubleshooting migration.

About this task

For information on migrating to Version 8.5, read Migrating product configurations. For more information on coexistence among releases, read Coexistence support.

Procedure

  1. Update product prerequisites and corequisites to supported versions.

    Refer to the IBM® WebSphere Application Server supported hardware, software, and APIs site for current requirements.

  2. Install the Version 8.5 product.
  3. Migrate your WebSphere Application Server Version 6.1 or above product configuration to Version 8.5.
  4. Migrate web server plug-ins as described in Migrating web server configurations.
  5. Optional: Set up multiple versions of WebSphere Application Server to coexist.
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Last updated: April 20, 2014 11:58 PM CDT
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