"Virtualization in a Nutshell
Simply put, virtualization is an idea whose time has come.
The term virtualization broadly describes the separation of a
resource or request for a service from the underlying physical
delivery of that service. With virtual memory, for example,
computer software gains access to more memory than is
physically installed, via the background swapping of data to
disk storage. Similarly, virtualization techniques can be applied
to other IT infrastructure layers - including networks, storage,
laptop or server hardware, operating systems and applications.
This blend of virtualization technologies - or virtual infrastructure
- provides a layer of abstraction between computing,
storage and networking hardware, and the applications running
on it (see Figure 1). The deployment of virtual infrastructure
is non-disruptive, since the user experiences are largely
unchanged. However, virtual infrastructure gives administrators
the advantage of managing pooled resources across the enterprise,
allowing IT managers to be more responsive to dynamic
organizational needs and to better leverage infrastructure
investments."
virtualization.pdf
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