VPS (Virtual private server) is a machine served by Internet hosting service. It is functionally equivalent to other physical computer configured to run server software. It is dedicated towards the need of its customers and provides privacy policies to them accordingly. The reason behind virtualization of server is time sharing and multiprogramming. Resource and time utilization are two important concept of multiprogramming. It can be done by using the idle time in responding to other clients. Virtualization process extends this concept to the computer as a whole and offer higher level of security. VPS can run its own OS and rebooted independently when needed. VPS has limited processor time, RAM and disk space as the number of virtualization clients are increasing only a single machine is shared by OS for resources.
There are number of companies providing virtual private server hosting as hosting services. VPS is dynamic that is it can be changed at runtime often referred as cloud servers. Additional hardware resources can also be added to the server at the runtime like: Central Processing Unit, Random Access Memory etc. While server is running it can be moved to another server. Business of web hosting is tricky, there are various options designed to accomplish wide range of requirements.
Share hosting is usually cheap and easy, but the resources are limited in this hosting method. Virtual Private Server is very flexible, scalable and economical in nature. It completely fits the hosting requirements of any website. VPS falls in between shared and dedicated hosting services not only in the means of price but also in functions.
VPS allows server level customization and software like: OS, cPanel, LAMP etc which require pre-installation by the clients based upon specific requirement. There are differences in the level of support provided to VPS platforms: un-managed, semi- managed and fully managed. Un-managed level, in this level hosting company is only responsible for hardware and network support and users are responsible for all software performance issues. Basically customer has to administer their own servers. In semi- managed level of hosting, the company is responsible for handling hardware, network, other standard software and the user is responsible for handling all custom software. In fully managed hosting, the host is responsible for all hardware, network and software related issues that handles the installation process of custom software. The level of hosting varies from one company to another. VPS cloud is the next step in acquiring higher level of performance and features set from hosting servers.
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