R. Skorupka wrote:

>The following scenario: z13 2964-N30 401 (yes, the smallest CPU) and ~1,5TB of 
>memory. z/OS 1.13 with RSU at Oct-2015 (plus 2964DEVICE, AFAIK).

Is that ONE CPU? How many LPARS are using that CPU?


>D M=STOR causes weird effects. System freeze for a while. For 2GB LPAR system 
>behavior is normal, for ~64GB LPAR there is few-second freeze, but for 1,1TB 
>LPAR system freeze for approx half a minute, TSO sessions are broken, the 
>*$HASP9211 JES2 MAIN TASK NOT RUNNING is issued. HMC monitor show 100% CPU 
>utilization.

It seemed like WAD, because all processes are competing for that 1 CPU, but the 
system gives that command a high priority, because the memory is made 'freezed' 
to give a reliable output. 

Which memory is NOT RECONFIGURABLE or RECONFIGURABLE? What is your Storage 
increment size?

Question: Are those messages shown during processing of that command or AFTER 
the output is shown. This may give a clue.


>IMHO such behavior is unacceptable even for testing activities.

Indeed. Time for a PMR.


>Is it bug or feature? 

It is a buggy bug!  Apparently the response time is worsening with increasing 
memory size. I'm smelling a badly designed D M=STOR command handler.

Groete / Greetings
Elardus Engelbrecht

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