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ny perform the management of in-house cloud by itself. The access is limited to a defined group of users within the company.An enterprise can keep their critical, confidential data, information and applications within their firewall, while hosting the non critical information ones on a public cloud.

(Adapted from Aslam et al. 2010, p. 400)

3.3 Providers of cloud services

The cloud computing technology has the task of helping companies to optimise and manage dynamically their IT infrastructure. Appendix 7, basedon astudyby U.S. market research

enterpriseBTCLogic, shows the Top10 cloud computing providers of 2011.

As a result, Amazon and IBM are characterised as the leading providers of cloud computing.

The figure below shows the relationship between users and providers of cloud computing.

It is focused on cloud computing effects on cloud providers and SaaS privders/cloud users.

Appendix 8 presents the benefits and disadvantages of the main cloud computing providers.

3.4 The costs of cloud computing

Infrastructure-as-a-Service (IaaS) is one of the most important market segments for cloud computing. Thus, Roto has the opportunity to purchase the required infrastructure resources such as computing power in the form of virtual servers and storage in a short-term. The company would pay only for the resources (usually per hour or gigabytes) which actually used within a period of time. A direct comparison with different cloud services is quite difficult. In addition, relevant price criteria in terms of computing, license, memory and storage are required to calculate the financial effort in detail. Every IT leader will be familiar with these essential information which also include technical background and IT specific knowledge. However, the following table shows where CIOs underestimate costs:

Cloud ComputingEnterprise Computing

Ÿ Bandwidth requirements for remote access to applicationsŸ Opportunities lost through commitment of capital

Ÿ Monitoring (may require custom development)Ÿ Risk of being overtaken by cloud start-ups with lower overhead

Ÿ Integration with legacy systemsŸ Operating and capital expenditures

Ÿ Migrating applicationsŸ Investments in failed deployments

Ÿ Ensuring capacity in a shared modelŸ Software upgrades, testing and rollout

Ÿ Hardware upgrades, replacing servers

Ÿ System administration

Ÿ Storage, backup, disaster recovery

(Adapted from Carr, DF 2011, p. 20)

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