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Would You Like More WLM Information In DB2 Accounting Trace - And How Would You Use It?
I was lucky enough to be in Silicon Valley Lab for DB2 BootCamp last week. There I ran into a DB2 developer I've worked very successfully with in the past - John Tobler. (He's the guy I look to for questions and issues with DB2 SMF data.) We had a good discussion about something I'd personally like to see in DB2 Accounting Trace - more WLM information - and this post is as a result of this... [More]
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zAAP and zIIP Revisited (At Last)
It's been an awfully long time since I wrote When Good Work Doesn't Go To zIIP / zAAP Heaven . And too long since I posted anything at all. In fact I had a bunch of posts in my brain until this morning when a customer asked me a question which turned into this blog post. (Those posts are still in my brain and will probably see the light of day eventually, including one based on a customer... [More]
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DDF Performance - Version 3 - but still highly relevant
I've just submitted a set of slides to Slideshare. They're not mine, they're not new, they're not even in a modern format. But they are a very good presentation worth preserving... In 1993 Curt Cotner presented a set of slides on the new DDF Inactive Thread support in Version 3 of DB2. It's still highly relevant and this support was the base on which the Version 4 WLM classification line item was... [More]
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What's In A Name?
This is the post I was going to write before the discussion that led to CICS VSAM Buffering arose. It's about getting more insight into how WLM is set up and performing than RMF Workload Activity Report data alone allows. I recognise some of this can be done with the WLM policy in hand. But this is about an SMF-based approach. (The piece you can't do with SMF is discerning the WLM classification... [More]
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Are You Being Served?
As you will’ve seen in
WLM Response Time Distribution Reporting With RMF I’ve been thinking about WLM Response Time goals quite a bit recently.
And this post continues the train of thought. It’s very easy to think of WLM Service Classes as being self contained.
For many that’s true - and only their own performance numbers need to be considered for us to understand their... [More]
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System z Technical Conference, San Antonio TX
Last week I was at the System z Tech Conference (again getting my zeds mixed up with my zees). :-) I presented 4 times, one of which was a repeat. What's especially nice is that I got 87 attendees for the "Memory Matters in 2008" presentation - spread across 2 sessions. This was despite the second time being the very last session of the conference... and 22 people still showed up to that! So... [More]
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Capacity, Performance and Systems Investigation
At one level Performance and Capacity Management and Systems Investigation are clearly linked: They share the same data. Or much of it at least. But I think they're linked in another way, too. Over the past few years I've gradually shifted emphasis towards Systems Investigation. But this has only been a slight shift, a "non modo sed etiam" and still only really mainframe. So I'm... [More]
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Discovering Report Class / Service Class Correspondences
It’s possible I’ve written something about this before:
My blog is so extensive now it’s hard to find out exactly what I’ve written about (and I’m going to have to do something about that). I say “written something ” because I know for sure I haven’t written about the SMF record field I want to introduce you to now. Previously If when you send me... [More]
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DYNDISP and DDF?
To whoever it is in Denmark that's repeatedly hitting my blog today with a search for "dyndisp" and "ddf" I'd love to know what it is that is causing you to search for those two terms together. As you're on my (day job) patch perhaps I should be talking to you directly. So feel free to contact me by clicking on this link . (I'm hoping the "mailto:" URL form works on your system.) And, yes, I am... [More]
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