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Cheryl Watson’s Tuning Letter Delivers z/OS Tuning, Hardware Picks, and Performance Tips

Aug 5, 2025

Cheryl Watson's Tuning Letter, IBM z Systems, IBM z17, IT Infrastructure, System Administration, z/OS, z/OS Tuning

Mark Wilson

Mark Wilson is a globally recognized thought leader and international speaker in mainframe security and technology, as well as a passionate advocate for all things Z. With more than 40 years of experience, Mark serves as the Editor of Cheryl Watson's Tuning Letter and as the Technical Director at Vertali. He is a multi-year IBM Champion and a Planet Mainframe Influential Mainframer.  

We are delighted to announce that Cheryl Watson’s Tuning Letter 2025 No.2 is now available.

If you haven’t already subscribed, now is your chance to discover the most comprehensive body of practical and impartial z/OS, and MVS tuning and measurement advice ever published — delivered in an informative, entertaining, objective, and comprehensive format.

You can read the Table of Contents for this issue on the Tuning Letter site, but as a preview, this issue contains:

  • z/OS 3.2 – Marna Walle of IBM gives us an overview of what’s new and improved with the upcoming 3.2 release of z/OS.
  • How not to buy the wrong CPC/CEC — and what if you did? – Don Zeunert of Protech gives us his insights into the considerations to be made when looking at that next hardware upgrade. This is very timely given the recent release of the IBM z17.
  • Don’t let breaking changes break you – Ed Jaffe of Phoenix Software International discusses open-source software and his experiences when it suddenly updates itself.
  • Sweating mainframe assets: Managing capacity, improving performance, and reducing mainframe running costs – Ciarra O’Connor of Vertali shares how to do more with less.

There are also articles looking at z/OSMF, as well our first ‘Jargon Buster’ article from John Baker of IBM. Plus:

  • News includes a fresh crop of performance and new function APARs
  • Highlights of IBM z17, aka 9175
  • Pointers to important hardware alerts
  • Information to help you plan your conference budgets for 2025 and 2026

Interested in reading the full articles? Subscribe to the Tuning Letter right here.

Want to chat? Catch me at SHARE Cleveland or email me at markw@planetmainframe.com!

All the best.
Mark Wilson

SAVE0002

Editor, Cheryl Watson’s Tuning Letter

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