Hardware Model Support in z/OS Release 7 RMF

(Originally posted 2005-11-11.)

This probably counts as my contribution to RMF for this decade. πŸ™‚

RMF has long had the Software Model for a processor in SMF 70. Until z900 this was the same as the Hardware Model. With z900 you could have processors that were there but you hadn’t bought yet.

With z990 it got a lot worse as you could have between 1 and 4 books on the processor.

In z990 (and z9-109) studies we would know, for example, that the processor was a z990 Model 324 but wouldn’t be absolutely sure whether it was a 3-book or a 4-book machine. With a 324 there’s nowhere to go without installing a fourth book – if you needed to add processors. And we, frustratingly wouldn’t know that.

Now, with Release 7 RMF we get the hardware model in addition to the software model. So we expect in future engagements to be a little more sensitive to what it would take to upgrade.

Actually here’s what you could do today – on Release 6 or prior…

The Logical Processor Sections in the SMF 70 record do record under the PHYSICAL LPAR the processor numbers. Here’s what I saw for the above-mentioned z990 Model 324:

  • 00,02,05,07,08,0A,0C,0E
  • 20,22,25,27,28,2A,2C,2E
  • 30,32,35,37,38,3A,3C,3E

I wrote those in 2-digit hex format for a reason: The first digit is the book number.

So where’s Book 1, then?

It doesn’t exist. So I conclude this is a C24 (3-book) machine.

If this was your machine you’d probably be saying Well, I know I bought a 3-book machine but, in my consultancy, I think I’d like to know that, too.

One other thing: You can tell what the engine type is from these sections. In this case they’re all General-Purpose CPs (GCPs) and that corresponds to what we happen to know about the client: 2 12-way dedicated LPARs and no ICFs, IFLs or zAAPs.

Now none of that is an “intended interface” but it is fascinating. πŸ™‚ But you are much better off with the 1.7 support for Hardware Model.

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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