Multiple Virtual Storage


Multiple Virtual Storage (MVS), was the most commonly used Operating System on the System/370 and System/390 IBM mainframe computers.

Multiple Virtual Storage was developed by IBM, but is unrelated to IBM's other mainframe Operating System, e.g., VSE, VM, TPF.

First released in 1974, Multiple Virtual Storage was extended by program products with new names multiple times:

  • first to MVS/SE (MVS/System Extensions),NB 1
  • next to MVS/SP (MVS/System Product) Version 1,
  • next to MVS/XA (MVS/eXtended Architecture),
  • next to MVS/ESA (MVS/Enterprise Systems Architecture),
  • then to OS/390 and
  • finally to z/OS (when 64-bit support was added with the zSeries models).

IBM added UNIX support (originally called OpenEdition MVS) in MVS/SP V4.3 and has obtained POSIX and UNIX™ certifications at several different levels from IEEE, X/Open and The Open Group. The MVS core remains fundamentally the same Operating System.

By design, Applications written for MVS run on z/OS without modification.

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