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IBM z/OS Consolidated Service Test and the RSU

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z/OS Consolidated Service Test - recommended service levels.

As part of IBM's commitment to quality and continuous improvement, we established an additional service testing environment called Consolidated Service Test (CST). As a result, we redefined our RSU (Recommended Service Upgrade) for the z/OS platform so that it contains service that has been through CST testing with all the current PTFs for these products listed together. We can now recommend PTF service for z/OS and key subsystems together in one RSU sourceid to all z/OS customers, free of charge.

  • CICS Transaction Server for z/OS
  • WebSphere Application Server for z/OS
  • DB2 for z/OS
  • Geographically Dispersed Parallel Sysplex (GDPS/Metro) (GDPS/MzGM)
  • IMS
  • IBM MQ for z/OS
  • z/OS
  • z/OS Management Facility
  • IRLM
  • Java™

Note: For a complete list of products/tools and levels tested, please consult the Quarterly report (PDF,155KB) , specifically the What Service was Installed section.

We test on a quarterly cycle, providing quarterly recommendations and monthly delta recommendations for customers needing more frequent maintenance updates. The table below shows our most recently tested service updates:

Month/Year Service Available RSU Sourceid
October 2022
3rd Quarter
Quarterly report (PDF,155KB)
All service through the end of June 2022 not already marked RSU. PE resolution and HIPER/Security/Integrity/Pervasive PTFs and their associated requisites and supersedes through August 2022. RSU2209

For additional information or comments, please contact the IBM Consolidated Service Test Team.

Look here for past RSUs which we've tested.

CST testing is performed in addition to existing testing programs and does not replace any current testing performed by the products.

Please note that the service recommendations we make on this website are based on testing in our own environment. Your environment and applications will differ, and therefore, your results may also. All of the information, download files, and recommendations are provided on an "AS IS" basis without warranties of any kind, express or implied, including without limitation any implied warranties of merchantability, fitness for a particular purpose or title. Reliance on this document is at the customer's sole risk and IBM will not be liable for any damages, direct or indirect, in connection with this website or actions taken based on the recommendations made on this website.

Note also that consolidated service test does not change the mechanism for reporting problems. If you encounter a problem with product code, you can report the problem to IBM Support.

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Document Information

Modified date:
03 October 2022