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A variety of technologies for managing computer resources by providing a software interface, known as an "abstraction layer," between the software (operating system and applications) and the hardware. Virtualization turns "physical" RAM and storage into "logical" resources. Following are the ways virtualization is used. See logical vs. physical.

Hardware Virtualization
Hardware virtualization is what most computer people are referring to when they talk about virtualization. It partitions the computer's RAM into separate and isolated "virtual machines" (VMs) simulating multiple computers within one physical computer. Hardware virtualization enables multiple copies of the same or different operating systems to run in the computer and prevents the OS and its applications in one VM from interfering with the OS and applications in another VM. See virtual machine and OS virtualization.

Network and Storage Virtualization
In a network, virtualization consolidates multiple devices into a logical view so they can be managed from a single console (see network virtualization). Virtualization also enables multiple storage devices to be accessed the same way no matter their type or location (see storage virtualization).

Application Virtualization
Numerous technologies fall under the umbrella of "application virtualization," some of which have been around for decades, while others are at the forefront. See application virtualization.

OS Virtualization
Under the control of one operating system, a server is split into "containers" that each handle an application. See OS virtualization.
References in periodicals archive ?
First Generation Block Storage Virtualization Architectures
Basically a way to share hardware between applications, virtualization allows the "pooling" of resources that results in consolidating hardware, maximizing the use of the remaining hardware.
NAS virtualization switches break the physical static mapping between clients and their storage recourses, decoupling the logical location from the physical location of the data.
These roadblocks, however, have now been pushed aside with one of the major vendors launching an intelligent switch-based storage virtualization solution with general availability of the product planned for 2006.
The virtualization software manages the virtual infrastructure and provides many flexible options and capabilities that support a disaster recovery environment and address the RTO component of the solution or plan.
The first question any adopter of storage virtualization (or any new technology for that matter) should ask is very simple--is the pain I am experiencing and hope to alleviate with this new solution significant enough to warrant the additional effort in deploying it?