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Start CA MII with the Address Space Creation Utility

Note: The Early Start Mechanism ensures that CA MII runs as a SYSTEM address space. However, if the Early Start Mechanism is in use and CA MII terminates, then restart CA MII using the Address Space Creation Utility.

In general, service providers should execute with a higher dispatching priority than service requestors. CA MIM provides vital system services for z/OS address spaces and users. Therefore, CA MIM must obtain the resources necessary to provide a time critical service. Execute the CA MIM address space as a system created address space to provide optimal throughput. System address spaces execute with a fixed dispatching priority of 255.

Utility Components

The CA MIM Address Space Creation Utility consists of two components:

MIMASCRE Program

MIMASCRE defines CA MIM as a system address space. MIMASCRE is included with the base CA MIM installation.

PROCASC JCL Procedure

The PROCASC sample JCL procedure executes the MIMASCRE program. PROCASC installs to the CAI.CBTDPROC data set and is included with the base CA MIM installation.

Using the ASCRE utility

• Use the z/OS START command to invoke the PROCASCR JCL procedure. As parameters, supply a CA MIM JCL procedure name and any JCL procedure overrides for use with the CA MIM JCL procedure. General syntax for the utility is as follows:

  START PROCASC,,,(parameters)
  

parameters

Specifies the CA MIM procedure name followed by any optional CA MIM JCL procedure overrides.

Examples:

1. Assume that CA MII is started using a JCL procedure named CAMIMGR.

   To use the CA MIM Address Space Creation Utility to start CAMIMGR as a system address space follow these steps:

   1. Customize the PROCASC JCL procedure to fit installation standards, rename it to MIMASC, and copy it to an appropriate procedure library.
   2. Start the utility. Assume that CAMIMGR is usually started with START CAMIMGR. To start CAMIMGR as a system address space issue:

      START MIMASC,,,CAMIMGR
      

      The MIMASC task starts and ends quickly, but creates a system address space named CAMIMGR. The CAMIMGR system address space continues through normal CA MIM initialization and remains active with a dispatching priority of 255 (hex ‘FF’) providing optimal throughput.

2. Assume the desired effect is:
   • Start CAMIMGR as a system address space.
   • Format the checkpoint file
   • Reuse the existing CA MIM CSA intercepts.
   • Issue the following z/OS START command:

     START MIMASC,,,(CAMIMGR,REUSE=YES,FORMAT=CHKPT)
     

     If CA MII is expected to manage heavy enqueue activity, execute CA MII as a system address space.

     The CA MIM Address Space Creation Utility does not provide as much benefit for the CA MIA or CA MIC components. Therefore, use the CA MIM Address Creation Utility for the CA MII component. Do not use the utility for the CA MIA or CA MIC components.

     Code a WLM classification rule to explicitly assign CA MIM to the SYSTEM service class.

     Note: An installation can assign CA MIM to one of these service classes in a classification rule. For example, assign CA MIM to a report class.

     When CA MII executes as a system address space, the CA MII address space name does not appear in the z/OS DISPLAY A,L command response. If automated procedures depend upon the z/OS D A,L command response, use the z/OS D A,taskname command where taskname is the CA MII JCL procedure name (not the MIMASCRE JCL procedure name). The MIMASCRE utility address space is active for only a few seconds while it launches the CA MIM task specified on the START command. MIMASC terminates immediately after it creates the desired CA MII address space.

     For important information about WLM classification rules specification, see the z/OS MVS Planning: Workload Management Guide.