87 zOS IO Performance Do You Have a Problem
Project and Program:
Performance and Capacity Management,
Core Platforms
Tags:
Proceedings,
2025,
SHARE Cleveland 2025
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.
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