IRD and zAAPs

(Originally posted 2005-07-11.)

This is perhaps fairly basic for those of you who’ve read the fine print on zAAPs and IRD, but I needed to see it in someone’s data:

IRD Weight Management will feel free to vary the weight for the “Type 1” pool for a z/OS LPAR with zAAPs. But it will keep the weight the same for the “Type 2” pool – for the zAAP/IFA engines.

In other words an LPAR with z/OS and zAAPs could have two weights:

  • A varying weight for the GCPs
  • A static weight for the zAAPs

So in your code (and ours) you have to cope with the possibility of two weights.

I raise this now as I’ve just seen it in some data from one of the Washington Systems Center machines: The LPAR had an initial weight of 300 and the 10 GCPs’ weight dropped to 151. The 2 zAAPs’ weight stayed at precisely 300.

Published by Martin Packer

I'm a mainframe performance guy and have been for the past 35 years. But I play with lots of other technologies as well.

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