Using a virtual datacenter is a great idea for those who do not have the time or resources to put together their own server system. Datacenters can be private or shared, and can have very few machines or can be compromised of many different systems. The whole point of a datacenter is to make use of powerful computing resource is without having wasted CPU usage, and minimize costs for the company using it. These can be added onto with further memory, bandwidth and also CPU hardware as the company’s needs grow and datacenter handles more requests, and will not result in costly or interrupting downtime or loss of important data.
http://myhosting.com/blog/2011/02/virtual-datacenter/