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Cloud Computing$
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Nayan B. Ruparelia

Print publication date: 2016

Print ISBN-13: 9780262529099

Published to MIT Press Scholarship Online: September 2016

DOI: 10.7551/mitpress/9780262529099.001.0001

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(p.1) 1 Introduction
Cloud Computing

Nayan B. Ruparelia

The MIT Press

What is the optimum investment required to provide computational resources? Since demand for computing varies, businesses face a dilemma: if they under-invest, then business suffers; if they over-invest, then they are utilizing their money inefficiently. Cloud computing resolves this dilemma by allowing businesses to invest in computing resources on an as needed basis. Thus, capital expenditure for computing is minimized since cloud computing provides a route to utilizing computational resources as operational expenditures.The NIST (National Institute of Science and Technology) defines clould computing as a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or interaction. This model promotes availability and is composed of five essential characteristics, three service models, and four deployment models.The definition is extended by including Business-Process-as-a-Service (BpaaS) and Information-as-a-Service (INaaS) as cloud service models in addition to the Infrastructure-, Platform-and Software-as-a-Service models of NIST. In addition, the four deployment models of cloud computing (public, private, community and hybrid) are discussed in terms of their scope and capabilities.Finally, the roles and responsibilities of cloud computing actors are outlined as creators, producers, brokers and consumers.

Keywords:   Capital Expenditure, Operating Expenditure, Cloud Computing Definition, Virtualization, Cloud Service, Service Models, Deployment Models, Scalability, Elasticity, Service Level Agreement

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