The physical server typically runs a hypervisor which is tasked with creating, releasing, and managing the resources of "guest" operating systems, or virtual machines.
Partitioning a single server to appear as multiple servers has been increasingly common on microcomputers since the release of VMware ESX Server in 2001. Although the resources are still shared, as under the time-sharing model, virtualization provides a higher level of security, dependent on the type of virtualization used, as the individual virtual servers are mostly isolated from each other and may run their own full-fledged operating system which can be independently rebooted as a virtual instance. The force driving server virtualization is similar to that which led to the development of time-sharing and multiprogramming in the past. However, as virtual servers share the underlying physical hardware with other VPSes, performance may be lower depending on the workload of any other executing virtual machines. A virtual server costs less than an equivalent physical server. For many purposes, it is functionally equivalent to a dedicated physical server and, being software-defined, can be created and configured more easily. The term " virtual dedicated server" ( VDS) also has a similar meaning.Ī virtual private server runs its own copy of an operating system (OS), and customers may have superuser-level access to that operating system instance, so they can install almost any software that runs on that OS. A virtual private server ( VPS) is a virtual machine sold as a service by an Internet hosting service.
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