Specifies that DFSMShsm serializes its control data sets with a global enqueue product (GRS for example) instead of serializing with volume reserves.

When you specify YES for this parameter, DFSMShsm serializes the use of the control data sets (between multiple z/OS images) with a global (SYSTEMS) exclusive enqueue and still allows multiple tasks within a single z/OS image to access the control data sets concurrently. All DFSMShsm hosts within an HSMplex must use the same serialization technique.

If you specify CDSQ=NO (without CDSSHR=RLS), the only allowable HOSTMODE for any DFSMShsm host within the HSMplex is MAIN.

For more information about serializing CDSs with the CDSQ keyword, see Serialization of control data sets with global resource serialization.