Sharing the CSD between different releases of CICS

Most releases of CICS® make changes to the IBM-supplied groups of resource definitions that are included in the DFHLIST group list. In all such cases, the old versions of the CICS resource definitions are retained in compatibility groups, which are needed to support earlier releases if you share the CSD between different levels of CICS.

If, after upgrading a CSD, you plan to share the CSD with earlier releases of CICS, include the appropriate DFHCOMPx compatibility groups in your start-up group list to provide the required support for earlier releases. Table 8 shows you which DFHCOMP groups you need to include for the earlier releases. Do not attempt to share a CSD with a CICS region running at a higher level than the CSD.

It is important that you install the compatibility groups in the correct order, as shown in Table 8. For example, to run a CICS/ESA 4.1, with the CSD upgraded to CICS TS 3.1, append the compatibility group DFHCOMP9 followed by DFHCOMP8, DFHCOMP7, DFHCOMP6, and DFHCOMP5 at the end of your group list.

Table 8. Required compatibility groups for earlier releases of CICS
CICS release the CSD is shared with The CICS release level of the CSD
CICS TS 3.1 CICS TS 2.3 CICS TS 2.2 CICS TS 1.3 CICS TS 1.2 CICS TS 1.1 4.1
CICS TS 2.3 None None Do not share Do not share Do not share Do not share Do not share
CICS TS 2.2 DFHCOMPA DFHCOMPA None Do not share Do not share Do not share Do not share
CICS TS 1.3 DFHCOMP9 DFHCOMP8 DFHCOMP9 DFHCOMP8 DFHCOMP8 None Do not share Do not share Do not share
CICS TS 1.2 DFHCOMP9 DFHCOMP8 DFHCOMP7 DFHCOMP9 DFHCOMP8 DFHCOMP7 DFHCOMP8 DFHCOMP7 DFHCOMP7 None Do not share Do not share
CICS TS 1.1 DFHCOMP9 DFHCOMP8 DFHCOMP7 DFHCOMP6 DFHCOMP9 DFHCOMP8 DFHCOMP7 DFHCOMP6 DFHCOMP8 DFHCOMP7 DFHCOMP6 DFHCOMP7 DFHCOMP6 DFHCOMP6 None Do not share
4.1 DFHCOMP9 DFHCOMP8 DFHCOMP7 DFHCOMP6 DFHCOMP5 DFHCOMP9 DFHCOMP8 DFHCOMP7 DFHCOMP6 DFHCOMP5 DFHCOMP8 DFHCOMP7 DFHCOMP6 DFHCOMP5 DFHCOMP7 DFHCOMP6 DFHCOMP5 DFHCOMP6 DFHCOMP5 DFHCOMP5 None
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