Storing descriptors

Descriptors that are created during system definition are stored in the IMS.PROCLIB member, DFSDSCMx. Subsequent system definitions of the same stage-1 input deck overwrite the DFSDSCMx member.

Recommendation: To avoid losing descriptors when member DFSDSCMx is replaced, store descriptors that you create by using TSO or z/OS® utilities in IMS.PROCLIB member, DFSDSCTy. If you need to update descriptors that are created at system definition in DFSDSCMx, use TSO or a z/OS utility (such as IEBUPDTE) to make the updates.