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Automatic system tuning

I READ YOUR ANWSER: I'm a big fan of the automatic system tuning feature. It reacts quickly and can be "tweaked" quite easily from the WRKSHRPOOL command interface. I would recommend that you turn on this feature by changing system value QPFRADJ to '3' - "Automatic adjustment".

This is my question we have iSeries 820 V5R2MO operating system. The system value for QPFRADJ is set to '2'. Can this help by changing it to '3'?

There is not much difference between the two settings, as noted in the HELP text for system value QPFRADJ:

Setting 2:

Each time you perform an initial program load (IPL) and periodically thereafter, the system examines the machine configuration, jobs running on the system, storage requirements, and so on, and makes performance adjustments to achieve effective utilization of system resources.

Setting 3:

The system periodically examines the machine configuration, jobs running on the system, storage requirements, and so on, and makes performance adjustments to achieve effective utilization of system resources.

Note: Performance adjustment at IPL does not take place.

If you only IPL once a month, the changes made at IPL time will most likely be overridden rather quickly by the dynamic adjustment feature associated with QPFRADJ=3. So what is the advantage? Probably not much.

What I do is set QPFRADJ to 3 and then as part of my backup process I execute CHGSHRPOOL commands to allocate resources to favor the submitted batch BU processes that run in the evening. After backups finish, I allocated memory back into the interactive memory pool in order to prepare for user sign on processes in the morning. I then let dynamic performance tuning take care of resource allocation during the day. This works quite well for me.

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This was last published in October 2004

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