Misc/vmware_vicp_1.jpg' alt='Download Vmware Vi Remote Client' title='Download Vmware Vi Remote Client' />Virtualization Wikipedia.In computing, virtualization refers to the act of creating a virtual rather than actual version of something, including virtual computer hardware platforms, storage devices, and computer network resources.Virtualization began in the 1.Since then, the meaning of the term has broadened.Hardware virtualizationeditHardware virtualization or platform virtualization refers to the creation of a virtual machine that acts like a real computer with an operating system. Download Progress Bar Image Gif . Software executed on these virtual machines is separated from the underlying hardware resources.For example, a computer that is running Microsoft Windows may host a virtual machine that looks like a computer with the Ubuntu Linux operating system Ubuntu based software can be run on the virtual machine.In hardware virtualization, the host machine is the actual machine on which the virtualization takes place, and the guest machine is the virtual machine.The words host and guest are used to distinguish the software that runs on the physical machine from the software that runs on the virtual machine.The software or firmware that creates a virtual machine on the host hardware is called a hypervisor or Virtual Machine Manager.In computing, virtualization refers to the act of creating a virtual rather than actual version of something, including virtual computer hardware platforms, storage.Different types of hardware virtualization include Full virtualization almost complete simulation of the actual hardware to allow software, which typically consists of a guest operating system, to run unmodified.Paravirtualization a hardware environment is not simulated however, the guest programs are executed in their own isolated domains, as if they are running on a separate system.Guest programs need to be specifically modified to run in this environment.Hardware assisted virtualization is a way of improving overall efficiency of virtualization.It involves CPUs that provide support for virtualization in hardware, and other hardware components that help improve the performance of a guest environment.Hardware virtualization can be viewed as part of an overall trend in enterprise IT that includes autonomic computing, a scenario in which the IT environment will be able to manage itself based on perceived activity, and utility computing, in which computer processing power is seen as a utility that clients can pay for only as needed.The usual goal of virtualization is to centralize administrative tasks while improving scalability and overall hardware resource utilization.With virtualization, several operating systems can be run in parallel on a single central processing unit CPU.This parallelism tends to reduce overhead costs and differs from multitasking, which involves running several programs on the same OS.Using virtualization, an enterprise can better manage updates and rapid changes to the operating system and applications without disrupting the user.Ultimately, virtualization dramatically improves the efficiency and availability of resources and applications in an organization.Instead of relying on the old model of one server, one application that leads to underutilized resources, virtual resources are dynamically applied to meet business needs without any excess fat Consonus.Tech. Hardware virtualization is not the same as hardware emulation.In hardware emulation, a piece of hardware imitates another, while in hardware virtualization, a hypervisor a piece of software imitates a particular piece of computer hardware or the entire computer.Furthermore, a hypervisor is not the same as an emulator both are computer programs that imitate hardware, but their domain of use in language differs.SnapshotseditA snapshot is a state of a virtual machine, and generally its storage devices, at an exact point in time.A snapshot enables the virtual machines state at the time of the snapshot to be restored later, effectively undoing any changes that occurred afterwards.This capability is useful as a backup technique, for example, prior to performing a risky operation.Virtual machines frequently use virtual disks for their storage in a very simple example, a 1.Any requests by the VM for a location on its physical disk are transparently translated into an operation on the corresponding file.Once such a translation layer is present, however, it is possible to intercept the operations and send them to different files, depending on various criteria.Every time a snapshot is taken, a new file is created, and used as an overlay for its predecessors.New data is written to the topmost overlay reading existing data, however, needs the overlay hierarchy to be scanned, resulting in accessing the most recent version.Thus, the entire stack of snapshots is virtually a single coherent disk in that sense, creating snapshots works similarly to the incremental backup technique.Other components of a virtual machine can also be included in a snapshot, such as the contents of its random access memory RAM, BIOS settings, or its configuration settings.Save state feature in video game console emulators is an example of such snapshots.Restoring a snapshot consists of discarding or disregarding all overlay layers that are added after that snapshot, and directing all new changes to a new overlay.MigrationeditThe snapshots described above can be moved to another host machine with its own hypervisor when the VM is temporarily stopped, snapshotted, moved, and then resumed on the new host, this is known as migration.If the older snapshots are kept in sync regularly, this operation can be quite fast, and allow the VM to provide uninterrupted service while its prior physical host is, for example, taken down for physical maintenance.FailovereditSimilarly to the migration mechanism described above, failover allows the VM to continue operations if the host fails.However, in this case, the VM continues operation from the last known coherent state, rather than the current state, based on whatever materials the backup server was last provided with.Video game console emulationeditA video game console emulator is a program that allows a personal computer or video game console to emulate a different video game consoles behavior.Video game console emulators and hypervisors both perform hardware virtualization words like virtualization, virtual machine, host and guest are not used in conjunction with console emulators.LicensingeditVirtual machines running proprietary operating systems require licensing, regardless of the host machines operating system.For example, installing Microsoft Windows into a VM guest requires its licensing requirements to be satisfied.Desktop virtualizationeditDesktop virtualization is the concept of separating the logical desktop from the physical machine.One form of desktop virtualization, virtual desktop infrastructure VDI, can be thought of as a more advanced form of hardware virtualization.Rather than interacting with a host computer directly via a keyboard, mouse, and monitor, the user interacts with the host computer using another desktop computer or a mobile device by means of a network connection, such as a LAN, Wireless LAN or even the Internet.In addition, the host computer in this scenario becomes a server computer capable of hosting multiple virtual machines at the same time for multiple users.As organizations continue to virtualize and converge their data center environment, client architectures also continue to evolve in order to take advantage of the predictability, continuity, and quality of service delivered by their converged infrastructure.For example, companies like HP and IBM provide a hybrid VDI model with a range of virtualization software and delivery models to improve upon the limitations of distributed client computing.Selected client environments move workloads from PCs and other devices to data center servers, creating well managed virtual clients, with applications and client operating environments hosted on servers and storage in the data center.For users, this means they can access their desktop from any location, without being tied to a single client device.
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