Stream: Woodcote
Time: 10:00 - 10:45
Here we are living in the future, where I/O is blazingly fast, at least compared to back in the day when we were waiting for platters to spin. And we have lots of memory so we can define large buffers and avoid a lot of I/O. And we have zHyperLink that can make disk I/O perform like coupling facility requests. So nobody has an I/O problem any more. Right? Well… that depends. You may think your I/O response times are fine but there may be I/Os that are not. Conversely, there may be a lot of I/O that really doesn’t impact application performance. And what sort of I/O response times should you expect anyways? According to which measurements? In this session Scott Chapman will explain some of the limitations of z/OS I/O measurements today, the difficulties of identifying what really matters to application performance, and ideas for how to better investigate and reason about I/O performance.
There is currently no attachment for z/OS I/O Performance: Do You Have a Problem?
Scott Chapman has over three decades of experience in the IBM mainframe environment. Much of this experience has focused on performance, from both the application and systems perspective. He's written COBOL application code and Assembler system exit code. He’s ported Java applications to the mainframe as well as developed unique Java applications. His mainframe responsibilities have spanned application development, performance tuning, capacity planning, software cost management, system tuning, sysplex configuration, WLM configuration, and most other facets of keeping a mainframe environment running effectively. At Enterprise Performance Strategies, Scott has helped customers around the world understand and improve the performance of their z/OS systems. He is one of the principal designers and developers of the Pivotor performance reporting product. Scott has spoken extensively at user group meetings and was honored to receive the Computer Measurement Group's Mullen award, and also co-authored a CMG best paper. He has also received SHARE’s Best Session Award multiple times and SHARE’s Distinguished Speaker award. Scott is a founding steering committee member of the Central Ohio Mainframe User's Group.
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