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Currently VLF statistics tracks ADD, DELETES, TRIM activity.
One of the most important activity in terms of VLF CPU usage is the PURGE activity (COFPURGE). SMF 41 should track also COFPURGE.
The purge activity consumes when the cache has many entries ( 100.000 or more ),
so could be great to track also the size of largest cache purged in the SMF interval.
Thanks.
Idea priority | Medium |
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In recent IBM case TS017126436 support mentioned the purge activity as a CPU driver for VLF. Using CATALOG display command we see some relation with high VLF activity and the increased purge number of a VLF catalog with more of 1 million entries. If you confirm that PURGE activity CPU is not proportional to size of purged cache I will reopen the case. Thanks for support,