Journal
JOURNAL OF COMPUTER AND SYSTEM SCIENCES
Volume 78, Issue 5, Pages 1330-1344Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcss.2011.12.017
Keywords
Cloud computing; Service layers; SaaS; AaaS; PaaS; IaaS; Interoperability; Service delegation; Federation of Clouds
Funding
- National Science Foundation (NSF) [OISE-0730065, IIP 0758566, CCF-0833039, DMS-0835436, CNS 0426354, IIS 0430826, CNS 0723594]
- Department of Energy [DE-FG02-06ER54857]
- The Extreme Scale Systems Center at ORNL
- IBM Faculty Award
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We show how a layered Cloud service model of software (SaaS), platform (PaaS), and infrastructure (laaS) leverages multiple independent Clouds by creating a federation among the providers. The layered architecture leads naturally to a design in which inter-Cloud federation takes place at each service layer, mediated by a broker specific to the concerns of the parties at that layer. Federation increases consumer value for and facilitates providing IT services as a commodity. This business model for the Cloud is consistent with broker mediated supply and service delivery chains in other commodity sectors such as finance and manufacturing. Concreteness is added to the federated Cloud model by considering how it works in delivering the Weather Research and Forecasting service (WRF) as SaaS using PaaS and laaS support. WRF is used to illustrate the concepts of delegation and federation, the translation of service requirements between service layers, and inter-Cloud broker functions needed to achieve federation. (C) 2012 Elsevier Inc. All rights reserved.
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