Chapter 8. z/OS base sysplex on z/VM 101
Global Resource Serialization (GRS) is used to extend ENQ processing to SYSTEMS
(all-members) scope and optionally to convert reserve/release requests that normally
serialize access to an entire volume to ENQ/DEQ requests that serialize specific data set(s).
GRS also uses CTCs to communicate among the members.
8.2.3 What a Parallel Sysplex® is
A Parallel Sysplex looks a lot like a base sysplex, but uses an IBM Coupling Facility (CF) for
signaling among systems. A parallel sysplex extends base sysplex functionality by storing
and retrieving lists of data contained in coupling facility structures. CF structures are used to
implement extended catalog facilities, workload balancing, subsystem functions (for ...