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All posts
Plan Your ESQA Carefully For z/OS Release 11
Thanks to Marna Walle for pointing out this change: In z/OS Release 11 there is a requirement for an additional 1608 bytes of ESQA per address space. To put that in context, I'll do some obvious maths: That's about 1.6MB per 1000 address spaces. It just might be of interest to certain customers I know with thousands of CICS regions in a system, or very large TSO or Batch systems. It's probably not... [More]
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DFSORT Does JOIN
A new set of function was recently made available for DFSORT via PTFs UK51706 and UK51707. In this post I want to talk about the new JOINKEYS function, and try to add a little value by discussing some performance considerations. I've had the code for a couple of months and have played with it but not extensively. So much of what follows is based on thinking about the function (described in this... [More]
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Channel Performance Reporting
Our channel reporting has consisted forever of a single chart. Before I tell you what the chart looked like I'll hazard that your channel reporting was about as bad. :-)
See, it's not something people tend to put much effort into.
Our one-chart report basically listed the top channels, from the perspective of the z/OS system under study, ranked by total channel utilisation descending - as a... [More]
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A Few Thoughts On Parallel Sysplex Test Environments
There's a pattern I've seen over a number of test Parallel Sysplex environments over the past few years, a couple of them in situations this year: It's not much use drawing performance inferences from test environments if they're not set up properly for performance tests. Sounds obvious, doesn't it? There are two problem areas I want to draw your attention to: Shared Coupling Facility Images If... [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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Hello World Again!
Apologies for being away. For a while I couldn't get the blog to operate - as an author. And then I gave up trying. :-( Count this as a "testing 1-2-3" post but also as notice I intend to back with more (hopefully useful) content soon. MUCH has happened in the "intermission". :-)
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European System z Tech Conference - Brussels 4-8 May 2009
I'm reporting what I'm learning (or I think is significant) in conference sessions on Twitter. My Id is "MartinPacker" and I'm using the Hashtag "#zOS09" to tag my posts. Feel free to follow along. In principle you don't even need to sign up to Twitter to do this. It seems more immediate than posting here. Oh, and feel free to comment on Twitter using the same tag.
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Javascript on z/OS For Beginners - Getting It To Run
Here's another "For Beginners" post to encourage people to just leap in and try it... Javascript is a language popularly used for such things as web pages with some programming in them (and that includes frameworks like dojo), building Firefox extensions, and the Adobe AIR (desktop) runtime. As it happens I'm pretty familiar with Javascript anyway - having done all 3 of the above. This post shows... [More]
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z/OS Unix System Services For Beginners - Java Hello World
In this post (and any others in a similar vein) I'm going to be displaying a great deal of ignorance - but I think I'm doing it in a good cause. I know a fair amount about things like Java, XML and C++ - but NOT on z/OS. So I'm determined to learn and present what I learn as "For Beginners" posts here. The idea is that I'll encourage other people with more traditional... [More]
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DB2 Data Sharing and XCF Job Name
Back in z/OS R.9 RMF Parallel Sysplex New Fields (in 2007) I mentioned a new field: R742MJOB (XCF Member Job Name.) At the time I had no real customer data so I could only espouse the HOPE that this field would be useful. (When I asked for it to be added to the SMF 74 Subtype 2 record it seemed to me it probably would be.) Now that z/OS R.9 is "mainstream" I'm seeing lots of data at this level.... [More]
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