z/OS interface considerations for IRLM

There are many requirements that you must consider and required steps to ensure a complete and correct installation of IRLM on z/OS®.

The following steps describe these requirements and required actions.

Add the IRLM CTRACE module to the z/OS link list
The IRLM CTRACE start/stop routine load module, DXRRL183, must reside in the z/OS Link List (LL). This module also contains the automatic restart manager (ARM) support for IRLM.
Authorize IRLM in the Authorized Program Facility (APF)
The IMS.SDXRRESL system data set must be APF authorized.
Create IRLM subsystem names
Unless you have deleted them, z/OS preconditioning has already defined IRLM and JRLM as subsystems names. You can use these names, or you can define your own. Create a z/OS subsystem name entry for each IRLM to be executed on the z/OS system. When two IRLMs reside in the same z/OS system, each must have a unique z/OS subsystem name.
Each message that the IRLM issues includes the IRLM z/OS subsystem name (IRLMNM on the start procedure) concatenated with the ID (IRLMID on the start procedure). A naming convention that allows easy identification of which IRLM issued a specific message is recommended. The following IRLM command displays all of the IRLM names and IDs associated with this IRLM or sharing group.
```
F irlmproc,STATUS,ALLI
```
Add an IRLM entry to the z/OS Program Property Table (PPT)
Unless you have deleted it, z/OS preconditioning has already defined a PPT entry for DXRRLM00.
Update the print dump exit control table
The entry must contain:
- Module name DXRRLM50
- Exit flag 0
- User verb IRLM
Ensure that one of these is true:
- The print dump formatting module DXRRLM50 is in SYS1.LINKLIB.
- The job that prints the dump contains a JOBLIB or STEPLIB statement specifying the library containing the modules.
Related reading:
- For more information about the Offline Dump Formatter, see IMS Version 15 Diagnosis.
- For information about adding an IRLM entry to the PPT, see Adding the IRLM entry to the z/OS Program Properties Table.
- Refer to z/OS MVS Initialization and Tuning Reference for information about:
  - Defining a subsystem to z/OS.
  - IEAAPFxx.
  - Responding to the messages and setting up PARMLIB members to contain trace options and parameters.