Introduction to Virtualization
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Virtualization uses software to create an abstraction layer over the computer hardware that allows the hardware elements of a single computer—processors, memory, storage and more—to be divided into multiple virtual computers, commonly called virtual machines (VMs).
Each VM runs its own operating system (OS) and behaves like an independent computer, even though it is running on just a portion of the actual underlying computer hardware.
It follows that virtualization enables more efficient utilization of physical computer hardware and allows a greater return on an organization’s hardware investment.
Today, virtualization is a standard practice in enterprise IT architecture. It is also the technology that drives cloud computing economics.
Virtualization enables cloud providers to serve users with their existing physical computer hardware
It enables cloud users to purchase only the computing resources they need when they need it, and to scale those resources cost-effectively as their workloads grow.
Like most organizations, you are probably facing new IT challenges as your business evolves and grows.
In a dynamic environment, you need to improve the agility to keep pace with fast-changing business needs.
We are demanding more responsive service and with more sophisticated applications.
As we try to keep pace with new requirements and growing demands, our IT infrastructure is becoming
larger and more complex—putting more pressure on our IT organization.
Virtualization helps address our most pressing technology challenge:
the infrastructure sprawl that’s forcing IT departments to channel 70 percent of their budget into maintenance
and sapping resources for business-building innovation.
The difficulty stems from the architecture of today’s X86 computers:
they’re designed to run just one operating system and application at a time.
That means that even small data centers have to deploy many servers and each operating at just 12 percent of capacity. That’s highly inefficient by any standard.
Virtualization software solves the problem by enabling multiple operating systems and applications to run on one physical server or “host.”
The creation of many virtual resources from one physical resource.
The creation of one virtual resource from one or more physical resources.
The term is frequently used to convey one of these concepts in a variety of areas such as networking, storage, and hardware.
Several companies offer virtualization solutions covering specific data center tasks or end user-focused, desktop virtualization scenarios.
Better-known examples include VMware, which specializes in server, desktop, network, and storage virtualization
Citrix: which has a niche in application virtualization but also offers server virtualization and virtual desktop solutions
Microsoft: whose Hyper-V virtualization solution ships with Windows and focuses on virtual versions of server and desktop computers.
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