https://www.ibm.com/docs/en/cics-ts/6.x?topic=upgrading-planning-upgrade
https://www.ibm.com/docs/en/cics-ts/6.x?topic=upgrading-planning-upgrade#planning_intro__check-cics-downward-compat You can run CICS TS for z/OS, beta regions in parallel with older CICS regions within the same LPAR if the following conditions are met: - Ensure that the eight CICS LPA-required modules <https://www.ibm.com/docs/en/SSJL4D_6.x/installing/dfha11h.html> that are installed in the LPA within the LPAR are from your CICS TS for z/OS, beta libraries. These mandatory LPA modules are downward compatible and your older CICS TS systems will work with these modules. The eight CICS LPA-required modules are listed below and are supplied in hlq.SDFHLPA: - DFHCSVC - DFHDSPEX - DFHDUMPX - DFHIRP - DFHSSEN - DFHSSGC - DFHSSWT - DFH99SVC On Mon, Jun 2, 2025 at 4:55 PM Steely.Mark < [email protected]> wrote: > I hope I can explain this clearly. We are SYSLEX and currently operate > four LPARs. I am planning to upgrade > the CICS CMAS and WUI regions on LPAR B. The upgrade of the CMAS and WUI > regions must be performed > simultaneously. As part of this upgrade, the CSD (CICS System Definition > file) will also be updated to > include the necessary compatibility groups. > > Additionally, the LPA, LNK, and APF libraries will be updated to reference > the new CICS release 6.2. Each > CICS region on LPAR B will be configured to use the new SEYUAUTH, > SEYULOAD, and CSD datasets > associated with release 6.2. > > This configuration has already been tested and is functional on a single > LPAR, where the CMAS and WUI are > running on CICS 6.2, while the connected CICS regions remain at release > 5.5. > > My question is: for the CICS regions on the other LPARs (still at 5.5) > that are connected to the CMAS running > on 6.2 on LPAR B-do these CICS regions also need to be updated in any way? > Specifically: > > > * Do their associated libraries (SEYUAUTH, SEYULOAD) need to be > updated? > * Can the upgraded CSD (with compatibility groups) be shared across > both versions? > > I would appreciate any guidance on compatibility requirements between CMAS > 6.2 and CICS regions at 5.5 across LPARs. > > Any information would be appreciated. > > Thank You > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
