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 and an earlier release simultaneously on the same machine.
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.
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 7.0 application servers are running on the same machine, they are coexisting.
For help in troubleshooting problems when migrating, read Troubleshooting migration.
For information on migrating to Version 7.0, read Migrating product configurations. For more information on coexistence among releases, read Coexistence support.
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