Microsoft , in a study entitled "The Economics of the Cloud" private Clouds notes bad issued. Compared with public clouds, they are relatively expensive and complicated to maintain, write Rolf Harms and Michael Yamartino, the authors of the study. the study is to read: "We see a long-term trend of cloud solutions, by three major economies of scale is caused: (1) Larger data centers, IT resources much lower cost to deploy as a small data centers, (2) by pooling demand resources are better used to, especially in public clouds, and (3) by the tenancy , labor costs to manage individual applications in a public cloud. Sink "

These effects would go to public Clouds economically interesting to explain Harms and Yamartino - especially because of their ability to adapt to changing circumstances - that companies would soon be difficult to justify its own IT infrastructure. Due to the economic attractiveness of public cloud services, it will of course always difficult to find reasons for private clouds, expected before the Harms and Yamartino. Public Clouds constitute advantages of 80 percent of the total cost for data centers to reduce costs by 40 times for small and medium enterprises and a reduction by a factor of ten larger companies.

A data center for a private cloud at around 1,000 servers would cost ten times more than the use of a public cloud service with the same performance. "If more work is done with public clouds, economies of scale come into play," is in the study."And the cost advantages over private clouds with time even bigger." Problems with security and performance would also be solved effectively. What are the specific disadvantages of private clouds? According to the observations of Harms and Yamatino can focus in private clouds as resources and demand. Difficulties with changing workload could be reduced, the security of the systems will be improved. However, they claim, the redistribution can load the virtual machines between the incompatibility and complexity are blocked.