Control data sets accessed in RLS mode enqueue certain resources differently from control data sets accessed in non-RLS mode. The following are software and hardware requirements for CDS RLS serialization in a multiprocessor environment:

Software

Global resource serialization or an equivalent function is required.

Hardware

All operating systems running with DFSMShsm must be coupling facility capable (SP 5.2 and up), and the processors must have access to the coupling facility.