Virtual Private Servers

Virtual private servers define the virtual machine used by an internet hosting service

. It functions much like having a separate physical computer to meet the needs of the customer. The term is used as a professional means of emphasizing a virtual machine which runs in software on the physical computer used by the customers other virtual machines. A virtual private server offers the privacy of a physical computer separate from other computers, but can be configured so as to run as a server, meaning it can run the software for a server.

The phrase virtual private servers has been used to indicate that a server does not use shared ram but the phrase also has several other meanings in use. Virtual private servers also let small businesses run legacy applications on older operating system servers using the same server as newer applications.

Each virtual private server can run a complete operating system which can be rebooted separately. Virtualized software has become a popular in the last few years with cloud computing. As such, virtual private servers have become an alternative to costly server packages and hosting services. They work by partitioning single servers so as to look like multiple servers.

Typically, a physical server will run a hypervisor. The hypervisor is responsible for the creation, release, and management of the guest operating systems or the virtual machines. Guest operating systems are given a specific amount of resources from the physical server. Generally, the guest does not know that other physical resources are saved for other computers or that it is allocated through the hypervisor. These guest systems can include paravirutalized, virtualizes, or hybrid systems.

Fully virtualized systems give the guest a virtualized set of hardware. The guest in this instance is unaware that the hardware is not completely physical. It is the hypervisors responsibility then to translate, map, or convert any requests which come from the guest system into the resource requests from the host. This will result in a large overhead. Nearly every system can be virtualized through this manner because it does not require modifications be made to the operating system. In order for this to happen though, a CPU supporting virtualization must exist so that the hypervisors are able to perform the full virtualization.

For paravirtualized environments guests are aware that the hypervisor is there and they interface directly with the resources of the host system. Here the hypervisor implements real-time control for access and allocation for resources. The result of this is near-native performances seeing as the guest will see the same hardware and will be able to communicate with the hardware natively. Only UNIX-like systems can support this type of virtualization. These systems include Plan9, Linux, BSD, and OpenSolaris.

Hybrid paravirtualization is known as full virtualization. Using this method the guest uses drivers which are paravirtualized for any main componenst such as Disk I/O or Networking. This results in increased performance for I/O. Operating systems which cannot endure modifications to support paravirtualization typically use this method.

by: hinalandhariya

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