Migrating involves collecting the configuration information from a previous release of a WebSphere Application Server product and merging it into a configuration for a new release. Coexisting involves running a new release of a WebSphere Application Server product on the same machine at the same time as you run an earlier release or running two installations of the same release of a WebSphere Application Server product on the same machine at the same time.
See Overview of migration, coexistence, and interoperability and Premigration considerations. For a compilation of links to documents and 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. The earlier release is still functional. If you run the earlier release at the same time as the WebSphere Application Server Version 6.1 installation, the two versions are coexisting.
For help in troubleshooting problems when migrating, see Troubleshooting migration.
For information on migrating to Version 6.1, see Migrating product configurations. For more information on coexistence among releases, see Coexistence support.
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