This is because with virtualization enabled, the host OS also runs on top of the Hyper-V virtualization layer, just as guest operating systems do. However, unlike guests, the host OS is special in that it has direct access to all the hardware, which means that applications with special hardware requirements can still run without issues in the host OS.
Install Hyper-V on Windows Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Virtualization occurs when a host machine uses its physical resources to host a virtual machine. The operating system of a virtual machine is independent of the operating system installed on the host machine. Since one physical machine can host multiple virtual machines, virtualization is considered Green IT.
It may provide critical resources such as applications, file-sharing services, and other productivity tools. A virtual machine is often called a guest. A hypervisor is a software that creates and manages a virtual machine on a physical or host machine. It is sometimes referred to as a virtual machine manager VMM.
A hypervisor can run several virtual machines on one host machine with each virtual machine running the same or different operating systems. The hypervisor assigns the physical resources to the virtual machine e. There are two types of hypervisors :. Virtualization software allows a single host computer to create and run multiple virtual environments. Several companies make virtual software for both desktops and servers. Common server virtualization includes:.
The virtual machine concept kept users separated while simulating a full stand-alone computer for each. As a result the concept of virtualization become less prominent. In most of these cases, either virtualizing one physical resource into many virtual resources or turning many physical resources into one virtual resource is occurring.
Server virtualization is the most active segment of the virtualization industry featuring established companies such as VMware, Microsoft , and Citrix. With server virtualization one physical machine is divided many virtual servers. At the core of such virtualization is the concept of a hypervisor virtual machine monitor.
A hypervisor is a thin software layer that intercepts operating system calls to hardware. Hypervisors typically provide a virtualized CPU and memory for the guests running on top of them.
Related to type 1 hypervisors is the concept of paravirtualization. Paravirtualization is a technique in which a software interface that is similar but not identical to the underlying hardware is presented. Operating systems must be ported to run on top of a paravirtualized hypervisor. Modified operating systems use the "hypercalls" supported by the paravirtualized hypervisor to interface directly with the hardware. The popular Xen project makes use of this type of virtualization.
Starting with version 3. These extensions allow Xen to run unmodified operating systems such as Microsoft Windows. Server virtualization has a large number of benefits for the companies making use of the technology. Among those frequently listed:. Virtualization is not only a server domain technology.
It is being put to a number of uses on the client side at both the desktop and application level. Such virtualization can be broken out into four categories:. Wikipedia defines application virtualization as follows:.
With streamed and local application virtualization an application can be installed on demand as needed. If streaming is enabled then the portions of the application needed for startup are sent first optimizing startup time. Hosted application virtualization allows the user to access applications from their local computer that are physically running on a server somewhere else on the network. Wikipedia defines desktop virtualization as:. Hosted desktop virtualization is similar to hosted application virtualization, expanding the user experience to be the entire desktop.
Benefits of desktop virtualization include most of those with application virtualization as well as:. Disadvantages of desktop virtualization are similar to server virtualization. There is also the added disadvantage that clients must have network connectivity to access their virtual desktops. This is problematic for offline work and also increases network demands at the office.
The final segment of client virtualization is local desktop virtualization. Some the benefits of local desktop virtualization include:.
Up to this point the types of virtualization covered have centered on applications or entire machines. These are not the only granularity levels that can be virtualized however.
Other computing concepts also lend themselves to being software virtualized as well. Network virtualization is one such concept. Part 1 Introduction to Windows Virtual Desktop. April 10, Mike Rodrick. Share this post:.
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