Virtualisation enables one server to do the job of many, sharing the resources of a single server across many environments & virtual machines...
Traditional computer infrastructures contain physical servers and computers and usually require a separate machine for each server role in an IT system. Virtual server technologies such as Microsoft Hyper V or VM Ware provide for the creation of an environment in which the number of physical devices can be greatly reduced as virtual server systems are consolidated on to fewer actual hardware devices.
Server virtualisation brings improved resource usage, reductions in power consumption and cooling requirement as well as reduced server rack space usage. In addition to these savings and lower capital outlay the virtualisation process can provide high availability to IT systems, the opportunity to bench test software & systems prior to deployment, reduced system down time, increased security and improved disaster recovery and business continuity options.
Virtualisation over the longer term reduces the cost of IT equipment, project management cost & technical staff: