Server Virtualization

  • It is the process of dividing a physical server into several virtual servers. It’s called virtual private servers. Each one can run independently. In this Virtualization widely used in the IT infrastructure .


Types of Server Virtualization

1. Hypervisor

  • Hypervisor plays an important role in server virtualization. It is a layer between the hardware and operating system (OS).
  • There are two types of hypervisors.
    • Type 1 hypervisor (It is also known as Native Hypervisors or Bare metal)
    • Type 2 hypervisor (It is also known as Embedded hypervisors or hosted)
  • It is mainly used to perform several tasks like allocate physical hardware resources (CPU, RAM etc.,) to several smaller independent virtual machines, called "guest" on the host machine.

2. Full Virtualization

  • It uses to directly communicate with the CPU and physical server. The best isolation and security mechanism to the virtual machines.
  • It can slow down the application and server performance that is the main advantage.
  • Example: VMWare ESX server.

3. Para Virtualization

  • Like as Full Virtualization.


  • Easier to use.
  • Enhanced performance.
  • Does not require emulation overhead.

4. Operating System Virtualization

  • It’s also known as system-lever virtualization.
  • It may be a server virtualization technology that separates one operating system into numerous isolated user-space called virtual environments. The greatest advantage of using server visualization is that it reduces the use of physical space, so it'll save money.


  • Linux OS Virtualization
  • Windows OS Virtualization


  • FreeVPS, OpenVZ
  • Linux Vserver

5. Hardware Assisted Virtualization

  • Hardware Assisted Virtualization was presented by AMD and Intel.
  • Hardware Assisted Virtualization is called as Hardware virtualization, AMD virtualization, and Intel virtualization.
  • It is used to increase the performance of the processor.

6. Kernel-Level Virtualization

  • Kernel-level virtualization is one of the important type of server virtualization. It is an open-source virtualization which uses the Linux kernal as a hypervisor. The advantage of utilizing kernal virtualization is that it does not require any administrative program and has very less overhead.


  • User Mode Linux
  • Kernel-based virtual machine

Advantages of Server Virtualization

  • Independent Restart
  • Low Cost
  • Disaster Recovery
  • Faster deployment of resources
  • Security

Disadvantages of Server Virtualization

  • When the server goes offline, all the websites that are hosted by the server. It will also go down.
  • There is no way to measure the performance of virtualized environments.
  • A huge amount of RAM consumption required..
  • It is very difficult to set up.
  • It is very difficult to maintain.
  • Some applications and databases are not supported in this virtualization.
  • To requires extra hardware resources.

Uses of Server Virtualization

  • It is used in the testing and development environment.
  • It improves availability of servers.
  • It allows organizations to make efficient use of resources.
  • It reduces redundancy.

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