The SCDS can be updated on other DFSMS releases. Before updating the SCDS, you must first apply coexistence PTFs on your system to ensure the integrity of the SCDS. Because new functional enhancements are not normally retrofitted, you need to update the SCDS to the most current level of the system. Back up the SCDS and ACDS as you would for any other production data set for the purpose of recovery. See z/OS V2R2 Migration for more information about the PTFs required and steps to take before you can update the SCDS.