Cloud Computing Essay Example | Topics and Well Written Essays - 3750 words

Cloud Computing - Essay Example Cloud computing is arguably the most popular emergent computing paradigm of the last decade (Hayes, 2009) and a technology at the peak of the Gartner hype cycle (Schonfeld, 2008). Cloud Computing aims at reducing the costs associated with management of hardware and software resources by shifting the computing infrastructure from on-site to on-network through the use of a variety of technologies that offer everything as a service under what could be generalized as â€Å"XaaS† (Rimal et al., 2009). X here could refer to software, platform, hardware, infrastructure, database, business, framework, organization and so on. One of the major challenges for the proponents of cloud computing has been to clear the confusion over the definition of cloud computing. Geelan (2009) analysed definitions from 21 cloud computing experts and none of them provided a unified definition as they all seemed to focus on different aspects of the cloud. To remove confusion with regards to what the cloud is in this research, we shall use the definition proposed by Vaquero et al. (2009) in this paper. Vaquero et al. (2009) built upon the work of Geelan (2009) and additional definitions from other experts to arrive at the definition below: Clouds are a large pool of easily usable and accessible virtualized resources (such as hardware, development platforms and/or services). These resources can be dynamically re-configured to adjust to a variable load (scale), allowing also for an optimum resource utilization. This pool of resources is typically exploited by a pay-per-use model in which guarantees are offered by the Infrastructure Provider by means of customized Service Level Agreements (SLAs) (Vaquero et al., 2009, p.51). ... One of the major challenges for the proponents of cloud computing has been to clear the confusion over the definition of cloud computing. Geelan (2009) analysed definitions from 21 cloud computing experts and none of them provided a unified definition as they all seemed to focus on different aspects of the cloud. To remove confusion with regards to what the cloud is in this research, we shall use the definition proposed by Vaquero et al. (2009) in this paper. Vaquero et al. (2009) built upon the work of Geelan (2009) and additional definitions from other experts to arrive at the definition below: Clouds are a large pool of easily usable and accessible virtualized resources (such as hardware, development platforms and/or services). These resources can be dynamically re-configured to adjust to a variable load (scale), allowing also for an optimum resource utilization. This pool of resources is typically exploited by a pay-per-use model in which guarantees are offered by the Inf rastructure Provider by means of customized Service Level Agreements (SLAs) (Vaquero et al., 2009, p.51). 2.0. Pros and Cons of Cloud Computing To appreciate the advantages of cloud computing and to analyse its disadvantages we have to first comprehend the different modes of delivery of this new paradigm. Each of these forms of delivery offers different advantages and disadvantages to different businesses. Cloud computing allows delivery of computing resources as services in the form of Infrastructure as a Service (IaaS), Platform as a Service (PaaS) or Software as a Service (SaaS) depending on the level of abstraction that the client desires. 2.1. Infrastructure as a service Under IaaS, instead of