Cloud Computing is not a new concept. Similar concepts were promoted before under different names such as: Virtulization, Capacity on Demand, Web hosting, Next Generation Data Centre (NGN), Utility computing, and others. If we dive into the subject further we find out today that DC clouds are classified as private clouds ( only serving one end user), and public clouds ( serving multiple customer on shared insfrastructure). A company might decide to go for a private cloud, Public Cloud, or mix. For instance, if security is of concern, and/or if the nature of their services and applications are of a very specific nature ( almost uniqe, or have been heavily customized), economy of scale is valid, and inhouse skills do not exist, then it makes sense to go for a private cloud. Also, the same company could consider a public cloud for their applications where secrurity is of a lesser concern, or where the industry offers a mature and pre-defined ready offered services. The cloud service provider today usually create a portfolio of offerings starting from: Infrastructure As A Service (IAAS), to Platform AS A Service (PAAS), to Software As A Service (SAAS), and hopefully reaching Everything As A Service (EAAS) or (XAAS). So if we take for instance IAAS we find the equivalent long offered services by the industry were: Web Hosting, Capacity on Demand, and Virtulization. If we take for instance AAAS we find very well mature services that existed for a long time and been used by large companies such as: Salesforce.com (CRM and others), Yahoo, google, Hotmail ( email), and of course web 2.0 forums ( facebook,Twitter,etc...). Similarly the XAAS is equivalent to what was known long back as "Full Outsourcing". In summary, Cloud Computing is nothing but rebranding some of the old concepts in a move by industry leaders to generate more infrastructure, software, and services revenues. Certainly Cloud Computing sounds as a good buzz word, but each company must evaluate it carefully taking into consideration the maturity of the service they are requesting, security, DC Tiering classifications, Skill sets, degree of customization, and most importantly the network connectivity cost which could be very expensive in some countries.
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