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All posts
New CPU Information In SMF Type 30 Records
Round about now you'd be expecting posts to be geared towards the recent zEC12 announcement, or perhaps CICS TS 5.1 or the DB2 11 Preview, or IDAA V3.
So what this post is about will probably have slipped by unnoticed.
After all you don't spend all your time looking for obscure New Function APARs, do you? But I think some of you will find this one of value, or at least quite interesting. (I... [More]
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System zEC12 CFLEVEL 18 RMF Instrumentation Improvements
I don't know how many of you will've spotted this but there was a nice instrumentation enhancement in the recent System zEC12 announcement. It comes with the RMF support for CFLEVEL 18 ( OA37826 and provides much more detail on paths to Coupling Facilities (CFs). Previously RMF reported channel path acronyms - one per path. And that was all. (A channel path acronym is something like... [More]
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I Know What You Did THIS Summer
Do you see what I did there? On March 10th I published the slides to "I Know What You Did Last Summer" on Slideshare . Since then I've given the presentation thrice and in the process got to know it a little. (Yes I really do think creations take on a life of their own, sort of autonomously.) So, six months on, I'm very pleased to have been asked to give the presentation again, but there are a... [More]
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Some Things You Might Not Know About VSAM SMF Type 64 Records
This was originally going to be a different post about VSAM's SMF
64 record, based on a customer situation. But it's morphed into
something else: A round up of "recent" enhancements to the SMF 64
record. "Recent"
is a nice euphemism: Some of these enhancements are 15 years old. But let's start the story at (or at any rate nearer to) the beginning... Back
in the early... [More]
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Time To Move From zAAPs to zIIPs?
Prompted by Troy Coleman's article zEC12 and zIIP Processors I thought I'd write about how I see the future for zAAPs. First, his article does a good job of covering the area. So I recommend you read it. Troy mentions the "zAAP on zIIP" function - which allows zAAP-eligible work to run on a zIIP. It's not news and it's a good piece of function: It means you can fill zIIPs more readily, making them... [More]
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Games You Can Play With Timestamps
I've written extensively in the past about what you can glean about batch suites from SMF, most notably SMF Type 30. While I don't believe SMF alone can give you the full dependency network (complete with validation) I've just added some analysis to my code that gets me a little closer. As you're probably never going to run my code the bit that would be interesting is the kind of inferences it's... [More]
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Another Usage Of Usage Information
This post is about unusual ways of using the SMF 30 Usage Data information, some of which you're certain to want if you're managing z/OS systems' performance. A long time ago I noticed character strings in SMF 30 records that looked like product names. (As is my wont I was looking at the raw Type 30 records for a different purpose and spotted them.) Some time later I figured out these were Usage... [More]
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New Blog Banner - In Honour Of The New zEnterprise EC12 (zEC12)
I hope you like my new blog banner - in honour of the new zEnterprise EC12. We actually announced the zEC12 (for short) the day I returned from vacation. Great planning, IBM! It's taken me a while to catch up - and changing the banner was an important step. I've known about the soon-to-be-announced processor range for quite some time, as I think you'd expect. And tracked what was going to be... [More]
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zIIP / zAAP Capacity Planning
I'm not a capacity planner but I play one on TV 1 sometimes. A customer asked me about the subject of zAAP Capacity Planning so I thought I'd post a few thoughts here. (Almost everything I say here is equally true of a zIIP.) The main point is I don't think it terribly different from regular CPU Capacity Planning. But there are some quirks: While we do have queuing we also have Crossover. But at... [More]
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The Low Down on Up Time
I can tell when a CICS region came up - without looking at CICS-specific instrumentation. What's more I can repeat the "trick" for any of MQ, DB2, IMS, etc - and so can you . I've just started work on a new piece of reporting. I'll call it "raddrspc" as that's the name of the REXX EXEC that I'm writing. It's about address spaces - most notably long-running ones. In the... [More]
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