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Cloud Computing Virtualization


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Cloud Computing Virtualization

 

·         In virtualization, a single physical instance of an application or resource is shared among multiple organization or tenants (customers).

·         It does so by assigning a logical names to a physical resources and providing a pointer to that physical resource when demanded

·         Creating a virtual machine over existing operating system and hardware is referred as Hardware Virtualization.

·         Virtual Machines provide an environment that is logically separated from the underlying hardware.

·         The machine on which the virtual machine is created is known as host machine and virtual machine is referred as a guest machine.

·         This virtual machine is managed by a software or firmware, which is known as hypervisor.

 

Hypervisor

Hypervisor is a firmware or low-level program that acts as a Virtual Machine Manager. There are two types of hypervisor:

Type 1 hypervisor runs on bare system. LynxSecure, RTS Hypervisor, Oracle VM, Sun xVM Server, VirtualLogic VLX are examples of Type 1 hypervisor.

Note: The type1 hypervisor does not have any host operating system because they are installed on a bare system.

 

Type 2 hypervisor is a software interface that emulates the devices with which a system normally interacts. Containers, KVM, Microsoft Hyper V, VMWare Fusion, Virtual Server 2005 R2, Windows Virtual PC and VMWare workstation 6.0 are examples of Type 2 hypervisor.

 

Type of Hardware Virtualization

There are mainly three types of hardware virtualization:

1.       Full Virtualization

2.       Emulation Virtualization

3.       Para virtualization

Full Virtualization: Here, the underlying hardware is completely simulated. Guest software does not require any modification to run

Emulation Virtualization: In Emulation, the virtual machine simulates the hardware and hence became independent of it. In this, the guest operating system does not require modification.

Para virtualization: In Para virtualization, the hardware is not simulated. The guest software run their own isolated domains

Note: VMware vSphere is highly developed infrastructure that offers a management infrastructure framework for virtualization. It virtualizes the system, storage and networking hardware


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