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Physical control files reside on hardware devices that are accessible by all systems in the enterprise. Examples of physical control files would be 1) a control file residing on shared DASD hardware and 2) a list structure residing in a coupling facility. With DASD control files, serializing access is achieved using RESERVE/DEQ macros and I/O operations are performed using the STARTIO macro. With coupling facility control files, serialization is achieved and I/O operations are performed using Cross System Extended Services (XES) IXL* macros. For this reason, the CA MIM coupling facility control files are commonly referred to as XES control files.
The following illustration shows these concepts:
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