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Installation and run-time support for CICS/VSE 2.3 on z/VSE 4.3 and higher



When z/VSE V4.3 became generally available on 26 November 2010, the installation and run-time support for CICS/VSE V2.3 changed significantly. z/VSE V4.3 is the last release that can be used as the run-time environment for CICS/VSE V2.3, but even this is subject to a number of restrictions. This document explains some of the changes that you need to be aware of when upgrading to z/VSE V4.3 or later versions and releases.


z/VSE V4.3 no longer provides product installation support for CICS/VSE V2.3. However, providing that DL/I is not required, IBM will not prohibit you from using CICS/VSE V2.3 with z/VSE V4.3. You will be able to install CICS/VSE V2.3 from an extended base tape supplied with a z/VSE V4.2 or earlier system. Alternatively, the CICS/VSE V2.3 sublibraries will remain in place if a Fast Service Upgrade (FSU) is used to upgrade to z/VSE V4.3. All other z/VSE V4.3 changes will be transparent.

z/VSE V4.3 is the last release that can be used as the run-time environment for CICS/VSE V2.3. For example, z/VSE V5.1 cannot be used as a run-time environment.

IBM recommends that you migrate CICS/VSE V2.3 applications to run on CICS TS for VSE/ESA on z/VSE V4.2 before upgrading to z/VSE V4.3 or later versions and releases such as z/VSE V5.1. If you want to run CICS/VSE V2.3 on z/VSE V4.3, ensure that both user and vendor applications still run successfully on CICS/VSE V2.3.

z/VSE-supplied support for a CICS coexistence environment is removed. However, you will still be able to run CICS/VSE V2.3 and CICS Transaction Server for VSE/ESA (CICS TS) V1.1.1 together on z/VSE V4.3.

IBM announced an end of support (EOS) date for CICS/VSE V2.3 of 31 October 2012. See CICS/VSE V2.3 End of Support announcement for more details.

Note: z/VSE V4.2 and later releases enable you to run RPG programs under CICS TS for VSE/ESA V1.1.1.

The following information is from the US Announcement Letter for IBM z/VSE V4.3 (ENUS210-313). Other country announcements are available on the IBM Offering Information page.

Enhancements for z/VSE V4.3 include:

Migration from CICS/VSE V2.3 to CICS Transaction Server for VSE/ESA on z/VSE V4.2:
  • z/VSE V4.3 fulfils the statement of direction in Software Announcement 207-228, dated October 09, 2007. It will no longer offer CICS/VSE V2.3 as part of the z/VSE V4.3 package and will remove the CICS coexistence environment.
  • Recent improvements, including BSM security enhancements in z/VSE V3, additional VSE tasks, and DOS/VS RPG II support for CICS TS in z/VSE V4.2, offer you the capability of migrating your CICS/VSE programs on z/VSE V4.2 prior to performing an upgrade to z/VSE V4.3 or higher releases.
  • Clients migrating to CICS TS might benefit from virtual storage constraint relief in CICS TS and in z/VSE V4.3.

DL/I VSE V1.12:
  • DL/I VSE V1.12 is an optional product of z/VSE V4.3. This new DL/I release will provide constraint relief for the limited 24-bit virtual storage area. Moving various resources above the 16 MB line will also allow for keeping more data in storage which might result in faster access to DL/I data. DL/I VSE V1.12 is the only DL/I release that can be used with z/VSE V4.3. It replaces DL/I VSE V1.11 and DL/I DOS/VS V1.10.

Related information

z/VSE web site

Product Alias/Synonym


Document information

More support for: CICS Transaction Server

Software version: 2.3

Operating system(s): z/VSE

Reference #: 1441484

Modified date: 02 December 2013

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