How Virtualization Works The interaction between the host servermachine and the

How virtualization works the interaction between the

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How Virtualization Works? The interaction between the host server/machine and the virtual machine is facilitated by software called Hypervisor (VMM). Hypervisor distributes the hardware resources such as CPU, memory to the virtual environments Terms to Remember A virtual server is a virtual machine running on a server. Virtual Machine Monitor (aka) Hypervisor, manages the virtual machine existing on a single host machine. Virtual Infrastructure Management Component is a tool that communicates with the hosts and their VMs such as OpenNebula. Virtualization Platform is the software that runs on the physical server, used to create host VMs such as VMware vSphere, Citrix and XenServer. Virtualization varies depending upon the resources you deal with: 1. Hardware Virtualization
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2. Software Virtualization 3. Storage Virtualization 4. Desktop Virtualization Hardware virtualization is the abstraction of physical hardware using the hypervisor. Hardware virtualization or server virtualization is the concept where you generally create a virtual machine on top of physical hardware. The hypervisor manages the virtual environment. Types Full virtualization Para virtualization Emulation virtualization Full Virtualization A technique in which user service requests are separated from physical hardware. The OS and the necessary software run on top of the virtual machine. The OS are unaware of virtualization. VMware Workstation, Virtual Box, and Hyper-V are few products that support full virtualization. Para-Virtualization Para-Virtualization is a technique that offers a software interface to the virtual machines. This interface will be similar but not identical to the underlying hardware-software interface. It is used to execute critical tasks in the host as against the virtual host. Guest OS recognizes the presence of the hypervisor and communicates directly with it. Xen, Oracle VM for X86 are some of few examples. Software Virtualization
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Software or application virtualization encapsulates or abstracts the programs/applications from the underlying hardware on which it is executed. It enables applications to run in environments not suitable for the native application. It reduces system integration and administration costs as it helps to maintain a common software baseline across multiple computers. Storage and Desktop Virtualization Storage Virtualization A concept where multiple physical storages are grouped to appear as single storage is known as storage virtualization. Desktop Virtualization A concept that stores the users desktop on a remote server allowing the user to access it from any device or any location is Desktop virtualization or client virtualization. Cloud Service Models Based on the organization's requirement, cloud providers offer a variety of services and resources, packaged as a service model.
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