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Revision Date Username Comment
703 Oct 2013 - 15:57norqu036? 
601 May 2013 - 10:46NicLewis 
514 Mar 2013 - 14:55NicLewis 
414 Mar 2013 - 11:24NicLewis 
311 Mar 2013 - 11:28NicLewis 
225 Feb 2013 - 10:38NicLewis 
121 Feb 2013 - 09:13NicLewis 

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Released in 1974, Multiple Virtual Storage (MVS) was an IBM operating system used on the System/370 and System/390 mainframe computers, but was unrelated to the other IBM mainframe operating systems in contemporaneous use.(1) Supporting multitasking and multiprocessing, MVS also allowed multiple simultaneous users, with the purpose of large-scale data reading and writing. MVS was designed to remain stable and dependable under heavy user loads.(2) Multiple computers running MVS could be interconnected to perform multiprocessing tasks, but each machine remained functionally independent of the others, allowing greater resilience in the event of a system failure, and allowing greater user control over the allocation of resources for each task. Security was an integral feature of MVS, including passwords for user logins, and the default access to another user's data was "no access." If a user attempted to access data for which they did not have access permission, the owner of that data would be notified by e-mail of the access attempt. In addition, if the system detected a possible data breach, all users were required to change their passwords.(3)(4) MVS is now part of IBM's z/OS, a 64-bit mainframe operating system introduced in 2000, featuring backward compatibility with older operating systems.(5)(6)


1 , 3 , 5 : http://en.wikipedia.org/wiki/MVS

2 : lock part6mvs.pdf, pp. 1-2, 5. -2001 Bob DuCharme book discussing the MVS operating system.

4 : lock part6mvs.pdf, pp. 1, 7-8, 24. -2001 Bob DuCharme book discussing the MVS operating system.

6 : http://en.wikipedia.org/wiki/Z/OS

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Topic revision: r5 - 14 Mar 2013 - 14:55:26 - NicLewis
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