There are two phases to migration that you need to consider. They are:

1. Migrating to the new release.

   If the installation does not plan to run a star complex after the new release is installed, re-IPL the system specifying GRS=JOIN to bring the system back into the ring complex. The only systems that should remain in the ring complex are systems connected to the coupling facility.

2. Converting from a ring complex to a star complex.