IBM z/OS Management Facility (z/OSMF)

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 How to Install another Product PSI (Semeru 21) into zOS 3.1?

Arlene Persinger's profile image
Arlene Persinger posted Tue April 29, 2025 02:06 PM

Hello,

I have recently deployed my zOS 3.1 PSI (with Java 17) and since Semeru 21 was made available after this, I ordered it as a separate PSI from ShopZ.   

  • Will I be able to 'merge' this Java into my existing zOS 3.1 environment?
  • ZOSMF requested the Target/DLIB zones names and when I specify the same as used for zOS 3.1, ZOSMF does indicate it needs unique names.  We currently use just one target/Dlib zone for the OS and IBM products, but I guess I'll have to create a new one if I want to put it into the same Global CSI?
  • Since my zOS 3.1 already has Java 17, what will happen with the same named datasets, i.e. SIEALNKE?  Will the Java 21 modules be merged into the same dataset?  Or do I have to create some new names and merge them manually later?

This is the first go around with ZOSMF / PSI and now with the addition of another product, so thanks in advance.

Arlene

Kurt Quackenbush's profile image
Kurt Quackenbush posted Tue April 29, 2025 02:51 PM

Arlene, z/OSMF currently has no "merge" capability which allows you to install Java 21 into the target and dlib zones for your existing z/OS 3.1.  But as you have already discovered you can install new target and dlib zones for Java 21 and connect them to your z/OS 3.1 global zone.  Yes you must provide unique names for these Java 21 target and dlib zones.  In addition, during the install you will NOT be merging or replacing the Java 17 data sets, so you must specify unique data set names for the Java 21 data sets, perhaps like SYS1.JAVA21.SIEALNKE.  The result will be two separate installed releases of Java,17 and 21.

I hope this helps.  Post up if you have additional questions.  Here's a couple blog post that discuss some of the issues and questions surrounding this new territory of managing multiple releases of Java;

https://www.marnasmusings.com/2023/08/having-your-java-and-drinking-it-too.html

https://www.marnasmusings.com/2025/03/keeping-up-with-javas.html

Kurt Quackenbush -- IBM, z/OSMF Software Management and z/OS SMP/E

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