Runtime Diagnostics (HZR) does 7 types of analysis only one of which has any 
association with OPERLOG.  If OPERLOG isn't in use, it just skips that type of 
analysis and puts a message in the list of events so that you know the OPERLOG 
portion wasn't successful (as opposed to letting you think everything was run 
successfully when it was not).  

The other 6 types of analysis -- high CPU, GRS latch contention, OMVS latch 
contention, local lock suspension, TCB loop detection, and enqueue contention 
checking -- are all still done even if OPERLOG isn't being used.  The OPERLOG 
dependency is only for message analysis.  So, HZR can and should still be used 
in the absence of OPERLOG. 

Karla Arndt
z/OS Predictive Failure Analysis and Runtime Diagnostics

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