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Virtual Machine
Introduction and History
The concept of the virtual machine was introduced by IBM as a method of time-sharing extremely expensive mainframe hardware (e. ... IBM defined a virtual machine as a fully protected and isolated copy of the underlying physical machine’s hardware. By using CPU scheduling and virtual-memory techniques, an operating system can create the illusion that a process has its own processor with its own memory. ... Sun’s Java architecture includes the JVM (Java Virtual Machine). ...
A software layer called a Virtual Machine Monitor (VMM) takes complete control of the machine hardware and creates virtual machines, each of which behaves like a complete physical machine that can run its own operating system.
The result of a complete machine virtualization is the creation of a set of virtual computers that runs on one physical computer. Different operating systems, or separate instances of the same operating system, can run in each virtual machine. The operating systems that run in virtual machines are termed guest operating systems. Since virtual machines are isolated from each other, a guest operating system crash does not affect the other virtual machines.
Approximate Word count = 849
Approximate Pages = 3.4
(250 words per page double spaced)
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