Using the global resource serialization function

A global resource serialization complex lets users on multiple z/OS® systems serialize access to processing and logical resources, such as data sets on shared DASD volumes.

Using global resource serialization to convert hardware RESERVES to ENQs minimizes several problems:

Interlocks
Job contention for the same volume
One system monopolizing a shared device
Data integrity exposures occurring if a system resets while a RESERVE is in effect

To convert the RESERVEs, place a generic entry for SYSZRACF in the RESERVE conversion resource name list (RNL) in your GRSRNLxx member in SYS1.PARMLIB. For further information, see z/OS MVS Planning: Global Resource Serialization.