Coupling Facility Control Code - IBM z13s Technical Manual

Systems management: The architecture provides the infrastructure to satisfy client
requirements for continuous availability, and provides techniques for achieving simplified
systems management consistent with this requirement.
Resource sharing: A number of base (z/OS) components use the coupling facility shared
storage. This configuration enables sharing of physical resources with significant
improvements in cost, performance, and simplified systems management.
Single system image: The collection of system images in the Parallel Sysplex is displayed
as a single entity to the operator, the user, and the database administrator. A single
system image ensures reduced complexity from both operational and definition
perspectives.
N-2 support: Multiple hardware generations (normally three) are supported in the same
Parallel Sysplex. This configuration provides for a gradual evolution of the systems in the
Parallel Sysplex without having to change all of them simultaneously. Similarly, software
support for multiple releases or versions is supported.
Through state-of-the-art cluster technology, the power of multiple images can be harnessed
to work in concert on common workloads. The z Systems Parallel Sysplex cluster takes the
commercial strengths of the platform to greater levels of system management, competitive
price for performance, scalable growth, and continuous availability.

3.9.1 Coupling Facility Control Code

The LPAR running the CFCC can be on z13, z13s, zEC12, zBC12, z196, or z114 systems.
For more information about CFCC requirements for supported systems, see 7.8, "Coupling
facility and CFCC considerations" on page 292.
Consideration: z13 and z13s systems cannot coexist in the same sysplex with System
z10 and previous systems. The introduction of z13s servers into existing installations might
require more planning.
CFCC Level 21
CFCC level 21 is delivered on z13s servers with driver level 27. CFCC Level 21 introduces the
following enhancements:
Asynchronous CF Duplexing for lock structures.
– z/OS V2.2 SPE with PTFs for APAR OA47796, DB2 V12 with PTFs
Enable systems management applications to collect valid CF LPAR information by using
z/OS BCPii
– System Type (CFCC), System Level (CFCC LEVEL)
– Dynamic Dispatch settings to indicate CF state (dedicated, shared, thin interrupt),
which is useful when investigating functional performance problems
z13 and z13s systems with CFCC Level 21 require z/OS V1R12 with PTFs or later, and
z/VM V6R2 or later for guest virtual coupling.
To support an upgrade from one CFCC level to the next, different levels of CFCC can be run
concurrently while the coupling facility LPARs are running on different servers. CF LPARs that
run on the same server share the CFCC level. The CFCC level for z13s servers is CFCC
Level 21.
z13s servers (CFCC level 21) can coexist in a sysplex with CFCC levels 17 and 19.
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IBM z13s Technical Guide