Public clouds become revolutionary innovation in IT which is not just for small and medium-sized businesses. At the moment, most companies are experimenting with public clouds as a resource for development and testing or for production applications with low requirements for security, protection of personal data and service levels. It is believed that large companies of public clouds may be of interest only in a specific niche, given their large investments in legacy systems and the critical role of such systems for their business. Nevertheless, a number of these companies see great potential in public clouds. They feel an urgent need to make a choice between pro-active work with the public and the clouds behind the competition.

We talked with many of the companies to begin with development of public cloud services providers in India. Naturally, the applications that these companies would like to move to public clouds being studied to determine their cost-effectiveness in this model. We propose a generalization read reviews over the ten kinds of hidden costs in the public cloud. We have split these costs into four broad categories:

• one-time cost of migration
• limitations of the model of billing
• residual costs of management
• risk premium

Single migration costs

Its costs are associated with moving existing applications to the traditional, physical infrastructure in the public cloud, including costs to modify the application and transfer of server systems, and associated with writing off the cost of equipment depreciation.

In this category there are two types of potential costs, for which you need to watch.

Rewriting applications. In a typical company, the most used applications are not yet ready for transfer to the cloud. Certain applications that already run on virtual machines or developed in accordance with the standards of the cloud platform, are well-tolerated. But most require significant processing or rewriting code to ensure compatibility. This is especially true for legacy applications. Organizations need to assess the economic feasibility of the transfer of such applications. It may be cheaper to keep them in original form or to completely abandon them in favor of new ones.

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