Statistics for CF Cache Structure; Utilized Storage Size

The 'Utilized Storage Size' for Cache structures in the Statistics for CF Cache Structure was incorrect and has been changed.

Reporting storage use for a cache structure is no longer a measure of utilization of the structure. UA67458 changes the Utilized Storage Size reported when Coupling Facility collection is done via KXDFCGET (in the TEMS RKLVLOG message 'KXDFC024: USING CF/XCF COLLECTION IN KXDFCGET........' is seen. See also note below.). With UA67458 applied, the Utilized Storage Size now shows the 'in use' percent of the total allocated objects (entries and data elements) for the structure. Value is a numeric value in the range of 0.0 through 100.0, to one decimal point precision.

The total allocated entries is reported in the Directory Entry Count. The total allocated data elements is reported in the Data Area Element. The new metric is calculated as follows:

(in use entries + in use data elements) / (Directory Entry Count + Data Area Element) * 100.0

The counts of in use entries and in use data elements are not externalized.

The Utilized Storage Size for cache structures shows utilization of the structure resources as the percent of allocated objects that are in use.


Note: RMF change OA41358 (at z/OS 1.13 level) will enable the new Utilized Storage Size value via CF collection with the RMF DDS (that is when message 'KXDFC023: SKIPPING CF COLLECTION IN KXDFCGET....' is seen in the TEMS RKLVLOG).