Virtualization In Cloud Computing

Virtualization In Cloud Computing

Article Cloud Computing


  • Virtualization typically refers to the creation of a virtual machine that can virtualize all of the hardware resources, including processors, memory, storage, and network connectivity.
  • With virtualization, physical hardware resources can be shared by one or more virtual machines.
  • According to the requirements from Popek and Goldberg, there are three aspects to satisfy the virtualization.
  • First, virtualization should provide an equivalent environment to run a program compared to a native system.
  • If the program shows a different behavior under virtualization, it may not be eligible as a virtualized environment.
  • Virtualization also needs to provide secure control of virtualized resources.
  • Having full control of resources is important to protect data and resources on each virtual environment from any threats or performance interference in sharing physical resources.
  • Virtualization often expects performance degradation due to the additional tasks for virtualization, but good performance should be achieved with software or hardware support in handling privileged instructions.
  • With these requirements, efficient virtualization is guaranteed.
  • In the following section, different types of hypervisors are explained with the implementation level of virtualization.
  • Virtualized resource is also presented in CPU, memory, and I/O transactions.

Diagrammatic representation of Virtualization

Virtualization In Cloud Computing

It contains three layers they are,

  • layer I comprising of network
  • layer II virtual infrastructures
  • layer III contain virtual machines

A virtual infrastructure consists of the components, such as,

  • Hypervisors
  • Virtual infrastructure services
  • Automated solutions to optimize the IT process.

Reasons for using virtualization are,

  • consolidate the workloads of under-utilized servers.
  • provides a secured and sandbox for running an untrusted application.
  • helps in building a secured computing platform.
  • provides an illusion of hardware.
  • simulates networks of independent computers.
  • for performance monitoring.
  • provides fault and error containment.
  • tools are good for research and academic experiments.


  • To understand virtualization, the hypervisor should be addressed first.
  • The hypervisor enables the communication between hardware and a virtual machine so that the virtualization accomplishes with this abstraction layer (hypervisor).
  • The hypervisor is originally called a virtual machine monitor (VMM).
  • These two terms (Hypervisor and VMM) are typically treated as synonyms.
  • A virtual machine monitor (VMM) is a software that manages CPU, memory, I/O data transfer, interrupt, and the instruction set on a given virtualized environment.
  • A hypervisor may refer to an operating system (OS) with the VMM.
  • Type 2 hypervisor is on the operating system to manage virtual machines easily with the support of hardware configuration from the operating system.
  • The extra layer between the hardware and virtual machine in the type 2 hypervisor causes inefficiency compared to the type 1 hypervisor.
  • VirtualBox and VMware Workstation are in this category.
  • The terms of Host or Guest machine (or domain) are used in the hypervisor to describe different roles.
  • The host machine (domain) contains a hypervisor to manage virtual machines, and
  • Guest machine (domain) means each virtual machine sitting on a hosted machine in a secure and isolated environment with its own logical domain.
  • With these separated roles, the hypervisor is able to offer resource boundaries to multiple virtual machines on the same physical machine.

In other words, the hypervisor is a software layer that creates a virtual environment with virtualized CPU, memory, and I/O (storage and network) devices by abstracting away the underlying physical hardware.

  • Virtual machine (VM) typically refers to an encapsulated entity including the operating system and the applications running in it as well.

Types of virtualization

  • Server virtualization is a kind of virtualization, used for masking of server resources,
  • Network virtualization combines all the resources in a network into channels
  • Storage virtualization is a pool of physical storage from a different network of storage devices that appears as a single storage device.
  • Desktop Virtualization supports various computing such as utility and dynamism, testing, development, and security.
  • Application Virtualization allows server consolidation, application and desktop deployment, business continuity.

Virtualization In Cloud Computing

Jyoti Mishra
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