Cloud Computing and Computing Evolution
Abstract
The term cloud computing is sometimes used to refer to a new paradigm some authors even speak of a new technology that offers IT resources and services over the Internet. The technology analysts at Gartner see cloud computing as a so-called emerging technology (Fenn et al. 2008) on its way to the hype. When looking at the number of searches for the word pair cloud computing undertaken with the Google search engine one can get a feeling of the high interest on the topic. Even terms like outsourcing, Software-as-a-Service (SaaS) or grid computing have already been overtaken (Google 2009). Although, nearly everybody in the IT sector speaks about cloud computing, the concept remains some-what unclear to many. With this contribution we aim to provide an understanding of cloud computing. Starting with a literature review on current definitions of cloud computing we will summarize the core characteristics and suggest a comprehensive definition. We will further examine the evolution of cloud computing from two different perspectives. From a technological point of view we will describe the phe-nomenons development, highlighting reoccurring trends in computing history. Eventually we will show, which components constitute the cloud computing concept. Our second perspective draws on the delivery model for information systems that changed through cloud computing. Our understanding of cloud com-puting is that of a new business model, for delivering IT resources and services, flexible, on demand and on a pay-per-use basis. We will conclude our contribution with an estimation about what classes of appli-cations appear to be promising for cloud computing.
Cloud Computing and Computing Evolution
Cloud Computing and Computing Evolution
MARKUS BÖHM, STEFANIE LEIMEISTER, CHRISTOPH RIEDL, HELMUT KRCMAR
Technische Universität München (TUM), Germany
1 Front Matter ....................................................................................................................... 3
2 Introduction ....................................................................................................................... 3
3 Understanding the concept of cloud computing: defining a new phenomenon ................. 3
3.1 Related work ............................................................................................................ 4
3.2 A Definition of cloud computing ............................................................................. 6
4 The evolution of cloud computing ..................................................................................... 6
4.1 A new computing paradigm ..................................................................................... 7
4.1.1 From the calculating machine to cloud computing ...................................... 7
4.1.2 A layered model of cloud computing ........................................................ 10
4.1.2.1 Cloud Application Layer .............................................................. 10
4.1.2.2 Cloud Software Environment Layer ............................................. 11
4.1.2.3 Cloud Software Infrastructure Layer ............................................ 12
4.1.2.4 Software Kernel Layer .................................................................. 13
4.1.2.5 Hardware / Firmware Layer .......................................................... 13
4.2 The changing IS delivery model ............................................................................ 13
4.2.1 Cloud computing as an evolution of outsourcing ...................................... 14
4.2.2 A value chain comparison ......................................................................... 15
4.2.2.1 Traditional IT Service Outsourcing Value Chain ......................... 16
4.2.2.2 Cloud Computing Value Chain..................................................... 16
4.2.2.3 Comparison ................................................................................... 18
4.3 What is new about cloud computing? .................................................................... 18
5 Promising applications for cloud computing ................................................................... 21
6 Back Matter ..................................................................................................................... 24
6.1 Summary and conclusions ..................................................................................... 24
6.2 Review Questions .................................................................................................. 24
6.3 Discussion Questions ............................................................................................. 24
6.4 Further reading ....................................................................................................... 25
6.5 Acknowledgments .................................................................................................. 25
6.6 References .............................................................................................................. 25
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