Migrating involves copying the configuration from a previous release of a WebSphere Application Server product into 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.
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.
If you have a previous version, you must decide whether to copy the configuration and applications of the previous version to the new version. Migration does not uninstall the previous version. To run an earlier release and the new release at the same time is coexistence. To support coexistence, you need to provide non-default port assignments during profile creation. See Overview of migration and coexistence for more information on coexistence.
You can also find more information on migrating to Version 6.0.x in the following document: WebSphere Application Server Version 6 Migration Guide.
You can coexist with or migrate the applications and configuration from a previous version of WebSphere Application Server.
Migration from Version 5.x to Version 6.0.x does not require extensive tuning. See Migrating product configurations for a description of fine tuning a migration. Part of the procedure for using the migration tools includes a description of what to tune after using the tools.
For more information on coexistence among releases, see Overview of migration and coexistence.
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