Installing CICSPlex SM modules in the MVS link pack area

There are benefits and points to consider if you use the MVS link pack area (LPA).

Benefits of using the LPA include:
  • Sharing – Two or more CICS® regions in the same MVS image can share modules in the LPA, giving an overall reduction in the total working set.
  • Integrity – the LPA is page-protected, even against key 0 programs, so all modules placed there are automatically protected against overwriting by other programs such as CICS applications. This integrity feature applies equally to a single CICS system in the processor.

Every CICSPlex® SM module installed in the LPA can be used only by the release of CICSPlex SM to which it relates.

CICSPlex SM supplies prebuilt SMP/E USERMODs as members in the CICSTS53.CPSM.SEYUSAMP library. The USERMOD is: 
  EYU$UM01 - Local MAS modules
These USERMODs contain ++MOVE statements for each module that is eligible for the extended link pack area (ELPA). A read-only module that can reside above 16 MB is eligible for the ELPA.

CICSPlex SM allocates an empty library for your use, called SYS1.CICSTS53.CPSM.SEYULPA. You can use SYS1.CICSTS53.CPSM.SEYULPA as the LPA library or you can add the modules to another LPA library.

If you are going to use SYS1.CICSTS53.CPSM.SEYULPA, verify that you have already authorized this library, described in Authorizing the CICS and CICSPlex SM libraries, and that you have applied appropriate security. You can give the SYS1.CICSTS53.CPSM.SEYULPA library your own high-level index. If you do, you must specify the new index on the LINDEX parameter of the DFHISTAR job.