Full virtualization Logical diagram of full virtualization. Running one or more applications that are not supported by the host OS: Instead, each OS running on a physical server becomes converted to a distinct OS running inside Hardware system virtual machine. Consolidating servers can also have the added benefit of reducing energy consumption.
Evaluating an alternate operating system: A virtual machine running the required guest OS could allow the desired applications to be run, without altering the host OS. A virtual machine can easily be relocated from one physical machine to another as needed.
Virtualization often exacts performance penalties, both in resources required to run the hypervisor, and as well as in reduced performance on the virtual machine compared to running native on the physical machine. In full virtualization, the virtual machine simulates enough hardware to allow an unmodified "guest" OS one designed for the same instruction set to be run in isolation.
Creating a protected environment: Examples of virtualization scenarios: For example, a salesperson going to a customer can copy a virtual machine with the demonstration software to his laptop, without the need to transport the physical computer. Reasons for virtualization[ edit ] In the case of server consolidation, many small physical servers are replaced by one larger physical server to increase the utilization of costly hardware resources such as CPU.
Likewise, an error inside a virtual machine does not harm the host system, so there is no risk of breaking down the OS on the laptop. Platform virtualization is performed on a given hardware platform by host software a control programwhich creates a simulated computer environment, a virtual machine VMfor its guest software.
The large server can "host" many such "guest" virtual machines. Because of the easy relocation, virtual machines can be used in disaster recovery scenarios.
This is very useful in kernel development and for teaching operating system courses. Multiple virtual servers could be run on a single physical server, in order to more fully utilize the hardware resources of the physical server.
A virtual machine could, depending on the virtualization software used, be duplicated and installed on multiple hosts, or restored to a previously backed-up system state.
There are several approaches to platform virtualization. Although hardware is consolidated, typically OSs are not.
The guest software executes as if it were running directly on the physical hardware, with several notable caveats. Access to physical system resources such as the network accessdisplay, keyboard, and disk storage is generally managed at a more restrictive level than the host processor and system-memory.
However, when multiple VMs are concurrently running on the same physical host, each VM may exhibit a varying and unstable performance, which highly depends on the workload imposed on the system by other VMs, unless proper techniques are used for temporal isolation among virtual machines.
This is known as Physical-to-Virtual P2V transformation. The guest software is not limited to user applications; many hosts allow the execution of complete operating systems.From servers and mainframes to storage systems and software, IBM provides the building blocks of a next-generation IT architecture that empowers your enterprise.
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Research graphics cards hardware, system requirements, and other related topics. Hardware virtualization is the virtualization of computers as complete hardware platforms, certain logical abstractions of their componentry, or only the functionality required to run various operating killarney10mile.comlization hides the physical characteristics of a computing platform from the users, presenting instead an abstract computing platform.
System16 - The Arcade Museum. Detailed Hardware information on Arcade Hardware and Systems. The Computer System Hardware category groups classes together that represent hardware related objects. Examples include input devices, hard disks, expansion cards, video devices, networking devices, and system power.
Embedded System Design: A Unified Hardware/Software Introduction Frank Vahid and Tony Givargis John Wiley & Sons; ISBN: Copyright (c) Book site at Wiley.Download