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. Because of the easy relocation, virtual machines can be used in disaster recovery scenarios.
Examples of Hardware system scenarios: Full virtualization Logical diagram of full virtualization. The guest software executes as if it were running directly on Hardware system physical hardware, with several notable caveats.
There are several approaches to platform virtualization. Running one or more applications that are not supported by the host OS: The large server can "host" many such "guest" virtual machines. 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.
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.
This is known as Physical-to-Virtual P2V transformation. 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.
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 can easily be relocated from one physical machine to another as needed.
A virtual machine running the required guest OS could allow the desired applications to be run, without altering the host OS. Evaluating an alternate operating system: 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.
Creating a protected environment: Although hardware is consolidated, typically OSs are not. 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.
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. This is very useful in kernel development and for teaching operating system courses. 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.
Consolidating servers can also have the added benefit of reducing energy consumption. The guest software is not limited to user applications; many hosts allow the execution of complete operating systems. 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.
Instead, each OS running on a physical server becomes converted to a distinct OS running inside a virtual machine.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. 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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Embedded System Design: A Unified Hardware/Software Introduction Frank Vahid and Tony Givargis John Wiley & Sons; ISBN: Copyright (c) Book site at Wiley.
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