Estimating coupling facility structure sizes

Estimating coupling facility structure sizes is useful to system programmers to help ensure that there is enough coupling facility storage to meet application needs. The estimation of the minimum central storage requirements of your List or Cache structure has been superseded by the following two commands used by the CFSizer Utility to make space calculations in the coupling facility:

• Compute list-structure parameters: For computing the minimum central storage requirements for a List structure. (What z/OS® calls lock structures are actually a special form of list structure.)
• Compute cache-structure parameters: For computing the minimum central storage requirements for a Cache structure.

Important: When implementing a new CFLEVEL in your configuration, redetermine the size of List and Cache structures using the CFSizer Utility and update the CFRM policy with the newly acquired values. For more information about the CFSizer Utility, see the following link: http://www.ibm.com/systems/support/z/cfsizer.

The zOSMF-based CF structure sizing support is also available through z/OS via the Sysplex Management /OSMF application.