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Tuesday, November 23, 2010

Server virtualization

Def :-  Server virtualization is the masking of server resources, including the number and identity of individual physical servers, processors, and operating systems, from server users. The server administrator uses a software application to divide one physical server into multiple isolated virtual environments. The virtual environments are sometimes called virtual private servers, but they are also known as guests, instances, containers or emulations.

There are three popular approaches to server virtualization: the virtual machine model, the paravirtual machine model, and virtualization at the operating system (OS) layer.

Virtual machines are based on the host/guest paradigm. Each guest runs on a virtual imitation of the hardware layer. This approach allows the guest operating system to run without modifications. It also allows the administrator to create guests that use different operating systems. The guest has no knowledge of the host's operating system because it is not aware that it's not running on real hardware. It does, however, require real computing resources from the host -- so it uses a hypervisor to coordinate instructions to the CPU. The hypervisor is called a virtual machine monitor (VMM). It validates all the guest-issued CPU instructions and manages any executed code that requires addition privileges. VMware and Microsoft Virtual Server both use the virtual machine model.

The paravirtual machine (PVM) model is also based on the host/guest paradigm -- and it uses a virtual machine monitor too. In the paravirtual machine model, however, The VMM actually modifies the guest operating system's code. This modification is called porting. Porting supports the VMM so it can utilize privileged systems calls sparingly. Like virtual machines, paravirtual machines are capable of running multiple operating systems. Xen and UML both use the paravirtual machine model.

Virtualization at the OS level works a little differently. It isn't based on the host/guest paradigm. In the OS level model, the host runs a single OS kernel as its core and exports operating system functionality to each of the guests. Guests must use the same operating system as the host, although different distributions of the same system are allowed. This distributed architecture eliminates system calls between layers, which reduces CPU usage overhead. It also requires that each partition remain strictly isolated from its neighbors so that a failure or security breach in one partition isn't able to affect any of the other partitions. In this model, common binaries and libraries on the same physical machine can be shared, allowing an OS level virtual server to host thousands of guests at the same time. Virtuozzo and Solaris Zones both use OS-level virtualization.

Server virtualization can be viewed as part of an overall virtualization trend in enterprise IT that includes storage virtualization, network virtualization, and workload management. This trend is one component in the development of autonomic computing, in which the server environment will be able to manage itself based on perceived activity. Server virtualization can be used to eliminate server sprawl, to make more efficient use of server resources, to improve server availability, to assist in disaster recovery, testing and development, and to centralize server administration.


  1. virtualization means one physical server shared to multiple user. It's the main advantages for server virtualiztion.website hosting

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  2. Realli nice information shared here, i am found of this virtualization technology. few years back i just used to here some big names for this like Citrix, VMWare etc. but now a days there are many cost effective alterntive to citrix like providers. It great that participation of people in this irtualization technology in increasing.

    Great Blog keep it on!!

  3. Great post Thank you for sharing your insights on this topic, found it very helpful Checkout and Reduce the Cost and Complexity of Your IT Systems by Leveraging Bold Tech Server Virtualization

  4. Very well described about the virtualization- it is awesome, and I appreciate your helping to share about this.

  5. virtualization means one physical server shared to multiple user. It's the main advantages for server virtualiztion.Network virtualization technology Virtualization at the OS level works a little differently. It isn't based on the host/guest paradigm. In the OS level model, the host runs a single OS kernel

  6. Interesting blog ....very helpful to readers about Virtualization Technology...thanks for sharing keep posting..!
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  8. Server virtualisation enables us to partition a physical server into a number of small servers called virtual server which is capable of running multiple servers. Really good information is shared over here. For more help Visit here