Partition Starter Find out what disk partitioning is, state key features, find a diagram and give an example.

3.2 - Virtualisation In computing, virtualisation means to create a virtual version of a device or resource, such as a server, storage device, network or even an operating system where the framework divides the resource into one or more execution environments. Even something as simple as partitioning a hard drive is considered virtualisation because you take one drive and partition it to create two separate hard drives. Devices, applications and human users are able to interact with the virtual resource as if it were a real single logical resource. The term virtualisation has become somewhat of a buzzword, and as a result the term is now associated with a number of computing technologies including the following:   Storage virtualisation: the amalgamation of multiple network storage devices into what appears to be a single storage unit. Server virtualisation: the partitioning a physical server into smaller virtual servers. Operating system-level virtualisation: a type of server virtualisation technology which works at the operating system (kernel) layer. Network virtualisation: using network resources through a logical segmentation of a single physical network. Application virtualisation

3.2 - Virtualisation A hypervisor or virtual machine monitor (VMM) is computer software, firmware, or hardware, that creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine.

3.2 Virtualisation Virtualisation is to create a simulated or virtual network, computer or server using software. Server virtualisation is not new; it has been used in mainframes since 1970s. Normally the operating system and hardware are closely linked so that only some applications can run simultaneously to prevent problems such as registry* conflicts. *The Registry contains information used by Windows and your programs. For example, when you change the Windows desktop, the changes are stored in the Registry

Virtualisation To operate additional applications, additional physical servers need to be installed, possibly running only a single application. Server virtualisation enables a single physical server to run several applications, each appearing to have its own server

Virtualisation Storage virtualisation works in a similar way by separating the physical storage server from the logical storage server. Storage virtualisation helps the storage administrator perform the tasks of backup, archiving, and recovery more easily -- and in less time -- by disguising the actual complexity of a storage area network (SAN).

Virtualisation Cloud computing is not virtualisation. The cloud uses existing technology to deliver services, such as security, storage and data manipulation, to users over a network. It is used like a utility – you can increase the size or range of your usage through payment.

Virtualisation Hybrid cloud computing is a mixture of private cloud, public cloud and locally owned services. As its activities and data requirements change, so the organisation can adjust its usage more effectively and efficiently.

Advantages of Virtualisation Saves energy - Changing physical servers over to virtual machines and consolidating them onto far fewer physical servers means lowering monthly power and cooling costs in the data centre. Different Types of Applications can run on one single physical server Reduces the data centre footprint This one goes hand in hand with the previous benefit. In addition to saving more of your company's green with a smaller energy footprint meaning far fewer servers and other hardware. Reduces costs That can further save you money if you don't happen to own your own data centre and instead make use of a co-location or sharing facility.

Disadvantages of Virtualisation It needs training to network administrators. Another downside of virtualisation is the need to spend a lot of money for training for the network administrator. Virtualisation might not be compatible with other servers and applications. Another drawback is the possibility that not all servers and applications are virtualisation friendly. This can be a problem when an investment has already been made on several servers or if the applications used to run your business do not have an upgraded version that allows for virtualisation.

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