Update your CFRM policy with coupling facility structure size changes
Description
If you are migrating to a new level of coupling facility control code (CFCC), you have to make appropriate coupling facility structure size updates in the z/OS® coupling facility resource management (CFRM) policy.
Table 1 provides more details about this migration action. Use this information to plan your changes to the system.
| Element or feature: | Multiple. |
|---|---|
| When change was introduced: | General migration action not tied to a specific release. |
| Applies to migration from: | z/OS V2R1 and z/OS V1R13. |
| Timing: | Anytime. |
| Is the migration action required? | Yes, if you are migrating to a new CFCC level. |
| Target system hardware requirements: | See http://www.ibm.com/systems/z/advantages/pso/cftable.html. |
| Target system software requirements: | None. |
| Other system (coexistence or fallback) requirements: | None. |
| Restrictions: | None. |
| System impacts: | None. |
| Related IBM® Health Checker for z/OS check: | None. |
Steps to take
- Run the Coupling Facility Structure Sizer (CFSizer) tool. This
tool sizes structures, taking into account the amount of space needed
for the current CFCC levels. The tool sizes for the most currently
available level; you might find that the results are oversized if
you use an earlier CFCC level. You can find the tool at Coupling Facility sizer.
Alternatively, you can run an as-is batch utility program called SIZER after you have brought a new CFLEVEL coupling facility into use in your configuration. SIZER examines your currently allocated coupling facility structures and recalculates the size that should be used for them with the new later-CFLEVEL coupling facility. The as-is SIZER utility is available as a zipped package that you can download from http://www.ibm.com/systems/support/z/cfsizer/altsize.html .
- Update the CFRM policy with the size modifications that are needed.
- Activate the updated CFRM policy so that it becomes the active policy governing structure allocation in the sysplex.
Reference information
For more information about coupling facility code levels and the processors that support those levels, see http://www.ibm.com/systems/z/advantages/pso/cftable.html .