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Ken,

I am sure there are many many theories, and the programmers of the Auto
Tuner are the only ones who really know.

My personal theory is that the Faults/Second thresholds on the WRKSHRPOOL
are set too loose. If they were tighter, you might find the activity levels
may go down.
Remember, the Auto Tuner is always behind the actual "happening"
performance, and therefore modifying future performance based on past
resource requirements and processing. If the past work was done
"successfully", then obviously... the AutoTuner has to put more work through
the pool, so it increases the activity levels!!

The shipped values for ALL the performance parameters tend to be very loose.
Recently, we have spent a little effort with several customers where we
tightened these values, resulting in more balanced performance and increased
throughput.

My 2 cents..
Trevor

----- Original Message ----- 
From: "Graap, Ken" <keg@xxxxxxxxxxxxx>
Subject: Auto Tuning


> I've always noticed that the Auto Tuning function of OS/400...
>
> .. never lowers the activity level (MAX Active from WRKSYSSTS) for a
storage
> pool, it just raises them slowly over time.
>
> Does anyone know why this is?
>
> Kenneth
>
> ****************************************


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