Preparing to set up a CAS

To set up a CAS, you need to:

Decide how to start the CAS
The installation process for CICSPlex® SM creates some skeleton start-up JCL that can be used to create and initialize the CAS. Each CAS requires a unique, four-character subsystem ID that must be included in the CAS start-up JCL.

A CAS can be started:

Although you have this choice, you are strongly recommended to start each CAS in your enterprise at MVS IPL time, because it avoids the sequencing problems that occur when components are started in an unexpected order. Also, you should consider CICSPlex SM to be an essential part of your environment, much as VTAM® and JES are considered today.

Provide CAS VTAM definitions
If your system "map" shows more than one CAS, you need to define some links between those CASs. For this, each CAS must have a VTAM application definition. Also, each CAS can be defined as a cross-domain resource, which allows it to be referenced across a link. Details of these requirements can be found in CICS® Transaction Server for z/OS® Installation Guide
Decide how the CICSPlex SM EUI is to be accessed
There are two ways of starting the CICSPlex SM EUI:
  1. You can start CICSPlex SM as an application from an ISPF menu, which requires you to make some permanent changes to your existing ISPF environment. In particular, you must add some CICSPlex SM libraries to the signon procedure, and update an appropriate ISPF menu to include CICSPlex SM as an option. This is the recommended way of starting CICSPlex SM.
  2. You can start CICSPlex SM from the TSO READY prompt by running the sample REXX EXEC that was created by the installation process. This requires no permanent changes to the current environment, but is a less efficient way of starting CICSPlex SM. One reason for this relative inefficiency is that the current dataset allocation has to be saved, the required CICSPlex SM libraries must be allocated, and the original data set allocation must be restored when the user has finished using CICSPlex SM. This approach is not recommended for regular use of CICSPlex SM, though it is a useful installation aid.
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