Ken,

The Coupling Facility spins waiting for work – it never idles to wait for work. 
 So the TYPE70 tells you it is 100% busy because it sees the spinning but the 
74s tell you when it was actually working as opposed to just checking to see if 
work was there for it.

Hope this helps,

Jim Horne


Author: khhwk...@comcast.net (Ken Hansen) 
Subject: Coupling Facility CPU utilization

In former times, Coupling Facility CPU utilizations were reported as High 
values (90-100% busy). This made it difficult to determine fail-over 
capabilities and was later amended by an IBM APAR the produced more realistic 
results. But in returning to this topic, I am seeing the TYPE70 records showing 
the ICF as 100% busy (z/OS 1.9) and the RMF Reports Coupling Facility reports 
showing the same thing. 

View article...

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