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Introduction
Virtualization is a technique of partitioning or dividing the resources of a single
server into multiple segregated execution environments. Each of these environments
runs independently of the other, thus allowing multiple operating systems to run on
the same hardware. This concept has been widely used in the world of mainframe
computers over the years, and is now gaining a lot of traction in the world of
enterprise IT systems. Each execution environment is called a guest and the server on
which they execute is called the host. The software running on the host that acts as
a bridge between the host and the guests, and that enables these multiple execution
environments is commonly referred to as the Virtual Machine Monitor (VMM) or
a Hypervisor.
There are three main methodologies used for providing virtualization:
System emulation: The execution environment is called a virtual machine and
it emulates all the hardware resources.
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