Information Technology Reference
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that should be isolated for other reasons, including business agility and enhanced
security.
Three general virtualization models exist. Hardware partitioning separates a
computer into separate pools of hardware, each of which acts as its own computer,
with its own operating system. Virtual machines rely on a hypervisor to enable
multiple operating system instances to share a computer. Operating system virtu-
alization creates virtual OS instances—software environments in which applica-
tions run in isolation from one another but share one copy of an OS and one OS
kernel.
Each model has both strengths and weaknesses. Each model has been imple-
mented on multiple hardware architectures, with each implementation being
most appropriate in certain situations. The more you understand the models and
implementations, the more benefit you can derive from virtualization.
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