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The facilities and evolution of MVS/ESA

 Award plaque by C. E. Clark

As new processors were developed with new capabilities, the Multiple Virtual Storage (MVS) operating system was modified and enhanced to utilize the latest advances. The most recently available processors are structured on Enterprise Systems Architecture, and MVS has evolved to be a part of this architecture as MVS/ESA. This paper describes the changes that occurred in MVS and the facilities that are currently available to support users of the latest processors.

Originally published:

IBM Systems Journal, Volume 28, Issue 1, pp. 124-150 (1989).

Significance:

MVS™ (Multiple Virtual System), introduced in 1972, was one of the first operating systems developed for mainframe computers. It is still widely used today, and is the dominant proprietary operating system for mainframes. MVS was the precursor of MVS/ESA™ and today's z/OS® systems, and had its roots in the OS/360. This paper discusses how MVS was developed, modified, and enhanced over time to add function and exploit the capabilities of a series of processors.

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