Flash Express Exploitation By Cfcc - IBM z13s Technical Manual

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, as shown in Table 7-63.
z13s (CFCC level 21) can coexist in a sysplex with CFCC levels 17 and 19.
Table 7-63 z Systems CFCC code-level considerations
z Systems
z13
z13s
zEC12
zBC12
z196 and z114
z10 EC or z10 BC
a. This CFCC level cannot coexist in the same sysplex with CFCC level 20 or 21.
For more information about CFCC code levels, see the Parallel Sysplex website at:
http://www.ibm.com/systems/z/pso/cftable.html
For the latest CFCC code levels, see the current exception letter that is published on
Resource Link at the following website:
https://www.ibm.com/servers/resourcelink/lib03020.nsf/pages/exceptionLetters
CF structure sizing changes are expected when upgrading from a previous CFCC Level to
CFCC Level 21. Review the CF LPAR size by using the CFSizer tool with is available at the
following website:
http://www.ibm.com/systems/z/cfsizer
Sizer Utility, an authorized z/OS program download, is useful when you are upgrading a CF. It
is available at the following web page:
http://www.ibm.com/systems/support/z/cfsizer/altsize.html
Before the migration, install the compatibility/coexistence PTFs. A planned outage is required
when you upgrade the CF or CF LPAR to CFCC Level 21.

7.8.2 Flash Express exploitation by CFCC

CFCC Level 19 is the minimum level that supports Flash Express. Initial CF Flash Express
exploitation is targeted for WebSphere MQ shared queue application structures. It is designed
to help improve resilience and provide cost-effective standby capacity to help manage the
potential overflow of WebSphere MQ shared queues. Structures now can be allocated with a
combination of real memory and SCM that is provided by the Flash Express feature.
Flash memory in the CPC is assigned to a CF partition through hardware definition windows,
which is similar to how it is assigned to the z/OS partitions. The CFRM policy definition allows
the maximum amount of flash memory that you want to be used by a particular structure, on a
structure-by-structure basis.
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IBM z13s Technical Guide
Code level
CFCC Level 20 or CFCC Level 21
CFCC Level 21
a
CFCC Level 18 or CFCC Level 19
CFCC Level 19
CFCC Level 17
a
CFCC Level 15 or CFCC Level 16
a