Understanding Virtualization

Again, virtualization uses hardware and software to create the illusion that two or more entities are present when there is only one physical entity in existence. The most common forms of virtualization include the following:

• Server virtualization: Making one server appear as many. Each virtual server may run the same or a different operating system. Server virtualization provides greater CPU utilization, a smaller equipment footprint, less power consumption, and support for multiple operating systems. A computer system running virtual software called a virtual machine.

• Desktop virtualization: This allows a user to switch between multiple operating systems on the same computer. Some desktop virtualization techniques can provide an operating-system environment on demand. Desktop virtualization provides support for multiple operating systems, which is very convenient for software developers, testers, and help-desk support staff. In addition, desktop virtualization leads to ease of computer maintenance and reduces desktop IT staff administration.

• Virtual networks: These create the illusion that a user is connected directly to a company network and resources, although no such physical connection may exist. Virtual networks are sometimes called virtual private networks or VPNs. Using a virtual private network, users can connect to a network and access the network resources from any Internet-connected computer. Virtual networks also allow network administrators to segment a network, making different departments such as management, development, and sales appear to have their own separate networks.

• Virtual storage: This provides users (and applications) with access to scalable and redundant physical storage through the use of abstract, or logical, disk drives or file systems, or a database interface.