Published on December 21, 2009
History The prototypical illustration of full virtualization is in the control program of IBM's CP/CMS operating system – first demonstrated with IBM's CP-40 research system in 1967, then distributed via open source in CP/CMS in 1967-1972, and re-implemented in IBM's VM family from 1972 to the present. Each CP/CMS user was provided a simulated, stand-alone computer. Each such virtual machine had the complete capabilities of the underlying machine, and (for its user) the virtual machine was indistinguishable from a private system. This simulation was comprehensive, and was based on the Principles of Operation manual for the hardware. It thus included such elements as instruction set, main memory, interrupts, exceptions, and device access. The result was a single machine that could be multiplexed among many users.
What is Virtualization? Virtual machine Physical machine A level of indirection between hardware and softwareVirtual Machines: a full abstraction of a physical machine
A level of indirection between hardware and software
Virtual Machines: a full abstraction of a physical machine
Learn more about VMware virtualization and virtual machine software, including server, desktop and network virtualization.
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This article scratches the surface of this Back to Basics series where we'll start to gain an understanding for the what and why behind virtualization.
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