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ADVANTAGES AND DISADVANTAGES OF VIRTUALISATION:

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ADVANTAGES AND DISADVANTAGES OF VIRTUALISATION:

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+     One of the top advantages of Virtualisation is that it requires less hardware to run the same type and amount of       software which brings down overall costs.
+      Virtualisation provides you with a safe platform on which you can test various software configurations and on various platforms prior to deployment. So in effect you can tinker with the software until you get what you exactly want without inadvertently damaging your existing network.
+       Better system security and reliability. Virtualisation systems do not crash due to corruption like device drivers or memory issues.

-       Even though rare, physical failures when they do happen can be devastating. For instance if your primary hard disk which contained all your virtual and physical data is suddenly stolen, burnt, broken or corrupted then all your servers both virtual and physical will need to be restored.
-       Virtualisation is mainly dependent on processing power and memory. So you’ll need to factor in both much more memory and processing power into your Virtualisationstrategy.
-       When something goes wrong with a virtualized system it requires complex troubleshooting. This requires expertise and experience of working and troubleshooting Virtualisation problems.

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Virtualization describes a technology in which an application, guest operating system or data storage is abstracted away from the true underlying hardware or software. A key use of virtualization technology is server virtualization, which uses a software layer called a hypervisor to emulate the underlying hardware. This often includes the CPU's memory, I/O and network traffic. The guest operating system, normally interacting with true hardware, is now doing so with a software emulation of that hardware, and often the guest operating system has no idea it's on virtualized hardware. While the performance of this virtual system is not equal to the performance of the operating system running on true hardware, the concept of virtualization works because most guest operating systems and applications don't need the full use of the underlying hardware. This allows for greater flexibility, control and isolation by removing the dependency on a given hardware platform. While initially meant for server virtualization, the concept of virtualization has spread to applications, networks, data and desktops.

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Virtualization is the creation of a virtual (rather than actual) version of something, such as an operating system a server, a storage device or network resources.