Implementation levels of virtualization

Implementation levels of virtualization

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  IMPLEMENTATION LEVELS OF VIRTUALIZATION By GokulnathS
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  VIRTUALIZATION  Virtualization isa computer architecture technology by which multiple virtual machines (VMs) are multiplexed in the same hardware machine.  Purpose of VM Enhance resource sharing by many users Improve computer performance in terms of resource utilization and application flexibility
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  DIFFERENCE BETWEEN TRADITIONALAND VITRUAL MACHINE  A traditional computer runs with a host operating system specially tailored for its hardware architecture.  After virtualization, different user applications managed by their own operating systems (guest OS) can run on the same hardware, independent of the host OS.
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  Tradition computer andAfter virtualization
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  VIRTUALIZATION LAYERS The virtualizationsoftware creates the abstraction of VMs by interposing a virtualization layer at various levels of a computer system  The instruction set architecture (ISA) level  Hardware level  Operating system level  Library support level  Application level
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  Application in FiveAbstraction levels
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  Advantage of OSExtension for Virtualization 1. VMs at OS level has minimum startup/shutdown cost. 2. OS-level VM can Easily Synchronize with its enviroment. Disadvantage of OS Extension for Virtualization  All VMs in the same OS container must have the same or similar guest OS, which restrict application flexibility of different VMs on the same physical machine.