What is z/OS? - Definition from Whatis.com

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z/OS

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z/OS

z/OS is the computer operating system for IBM's zSeries 900 (z900) line of large (mainframe) servers. z/OS is a renamed and upgraded version of OS/390, which in turn evolved from the MVS operating system. IBM's renamed servers and operating systems reflect a strategy to realign its products more closely with the Internet and its own e-business initiatives.

z/OS is described as an extremely scalable and secure high-performance operating system based on the 64-bit z/Architecture. Like its predecessor, OS/390, z/OS lays claim to being highly reliable for running mission-critical applications. The operating system supports Web- and Java-based applications.

Related glossary terms: data center evaporative cooling (swamp cooling), HP OpenView, event forwarding, VM (virtual machine), smoke testing, COBOL (Common Business Oriented Language), Bloom Energy Server, fuel cell, BAL (Basic Assembler Language or branch-and-link), cook-off test

This was last updated in April 2001

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