IMS subsystems are implemented on a z/OS system. IMS uses some of the facilities of the z/OS operating system.
In This Chapter
IMS is a large application that runs on z/OS. IMS and z/OS are both designed to provide the most efficient use of the hardware and software components.
IMS runs as a z/OS subsystem and uses several address spaces: one controlling address space, several separate address spaces that provide IMS services, and several address spaces that run IMS application programs. z/OS address spaces are sometimes called regions, as in the IMS control ...