The execution environment for CICS® data sharing server regions is provided by a run-time environment package called the authorized cross-memory (AXM) server environment. To establish AXM cross-memory connections for an MVS™ image, initialize the AXM system services by defining an MVS subsystem called AXM. The AXM subsystem initialization routine, AXMSI, sets up the appropriate definitions from the master scheduler region. Note that AXM uses the subsystem definition only as a means of scheduling AXM initialization in the master scheduler address space. The MVS subsystem interface for AXM is not activated or used.
To define the AXM subsystem statically, the normal method, add an entry with the required parameters to the IEFSSNxx member of SYS1.PARMLIB, as follows:
SUBSYS SUBNAME(AXM) INITRTN(AXMSI)
Defining AXM in the IEFSSNxx member ensures that AXM system services automatically become available when you IPL MVS.
To avoid the need to wait for an IPL when AXM modules are first installed, you can also initialize AXM system services by defining the subsystem dynamically, as follows:
SETSSI ADD,SUBNAME=AXM,INITRTN=AXMSI
If initialization of the AXM subsystem fails for any reason, (for example, because of an error in the command, or because AXMSI is not in a linklist library) MVS does not allow another attempt because the subsystem is then already defined. In this case, you should use a different subsystem name, such as AXM1, because AXM does not rely on a specific subsystem name. If you start AXM successfully the first time, further attempts are ignored.
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