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Rajkumar Buyya - One of the best experts on this subject based on the ideXlab platform.
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service Level Agreement sla based saas cloud management system
International Conference on Parallel and Distributed Systems, 2015Co-Authors: Saurabh Garg, Rajkumar BuyyaAbstract:Cloud computing has emerged as a new computing paradigm which has revolutionized the IT industry. It has particularly transformed the licensing of software products which are now being offered as a Service on pay-as-you-go basis. This has tremendously increased the complexity for software providers as they now have to not only manage their resources on which software are hosted but also they need to provide expected Quality of Service for customers. The Quality of Service (QoS) required by customers is guaranteed using a legal document SLA (Service Level Agreement). Current, resource management systems do not cater to the needs of a Software as a Service (SaaS) provider who requires to provide flexible and low cost services while not affecting their profit and market share. Most of them focus either at infrastructure Level or at platform Level. This work fills this gap by proposing a novel SLA based resource management system designed after analysing requirements of SaaS in Clouds. The proposed system is implemented using latest technologies and can scale in and out depending on updates in the user demand. We present the architectural design and evaluate the implementation with a real case study in a real Cloud environment.
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a dependency aware ontology based approach for deploying service Level Agreement monitoring services in cloud
Software - Practice and Experience, 2012Co-Authors: Amir Vahid Dastjerdi, Sayed Gholam Hassan Tabatabaei, Rajkumar BuyyaAbstract:Cloud computing offers virtualized computing elements on demand in a pay-as-you-go manner. The major motivations to adopt Cloud services include no upfront investment on infrastructure and transferring responsibility of maintenance, backups, and license management to Cloud Providers. However, one of the key challenges that holds businesses from adopting Cloud computing services is that, by migrating to Cloud, they move some of their information and services out of their direct control. Their main concern is how well the Cloud providers keep their information (security) and deliver their services (performance). To cope with this challenge, several service Level Agreement management systems have been proposed. However, monitoring service deployment as a major responsibility of those systems have not been deeply investigated yet. Therefore, this paper shows how monitoring services have to be described, deployed (discovered and ranked), and then how they have to be executed to enforce accurate penalties by eliminating service Level Agreement failure cascading effects on violation detection. Copyright © 2011 John Wiley & Sons, Ltd.
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Service Level Agreement (SLA) in Utility Computing Systems
arXiv:1010.2881, 2011Co-Authors: Linlin Wu, Rajkumar BuyyaAbstract:In recent years, extensive research has been conducted in the area of Service Level Agreement (SLA) for utility computing systems. An SLA is a formal contract used to guarantee that consumers' service quality expectation can be achieved. In utility computing systems, the Level of customer satisfaction is crucial, making SLAs significantly important in these environments. Fundamental issue is the management of SLAs, including SLA autonomy management or trade off among multiple Quality of Service (QoS) parameters. Many SLA languages and frameworks have been developed as solutions; however, there is no overall classification for these extensive works. Therefore, the aim of this chapter is to present a comprehensive survey of how SLAs are created, managed and used in utility computing environment. We discuss existing use cases from Grid and Cloud computing systems to identify the Level of SLA realization in state-of-art systems and emerging challenges for future research.
Aun Haider - One of the best experts on this subject based on the ideXlab platform.
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Stochastic Wind Energy Management Model within smart grid framework: A joint Bi-directional Service Level Agreement (SLA) between smart grid and Wind Energy District Prosumers
Renewable Energy, 2019Co-Authors: Izhar Hussain, U. Farid, C. A. Mehmood, Muhammad Jawad, Zahid Ullah, Bilal Khan, S. M. Ali, Aun HaiderAbstract:Abstract The evolvement of prosumers (energy producing consumers) in Smart Grid (SG) ensures reliable and efficient bi-directional power-flow. However, the prosumers interactions and interfacing within the SG system requires a bi-directional Energy Management Model, a demanding task to monitor, manage, and measure probabilistic prosumers activities. Considering weather parametric effects with Price-Based Programs and generation capacity of prosumers within Energy District (ED) is highly complex and stochastic problem, we propose Stochastic Wind Energy Management Model (SWEMM) with bi-directional energy flows between SG and Wind Energy Prosumers (WEPs). Moreover, our model incorporates an effective Service Level Agreement (SLA) design for efficient energy exchange structure between both parties (SG and WEPs). Furthermore, non-linear Stochastic price model is employed that overcomes the uncertainty of market price with SLA implementation, while wind energy estimation model within ED is employed for prosumer energy generation. The aforementioned models are incorporated for SWEMM that maximizes Prosumers Energy Surplus (PES) and minimizes Prosumer Energy Cost (PEC), while Grid Revenue (GR) maximizes for SG. Finally, data analysis (3D-plots) of Copano Bay (Texas US), model simulation and SLA validation with convergence and divergence plots with tabular statistics prove the effectiveness of our proposed model. We believe that our work is more versatile in modeling stochastic energy management model for SG and WEPs, compared to prior works.
Jian Ying Zhang - One of the best experts on this subject based on the ideXlab platform.
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autonomous service Level Agreement negotiation for service composition provision
Future Generation Computer Systems, 2007Co-Authors: Ryszard Kowalczyk, Mohan Baruwal Chhetri, Jian Ying ZhangAbstract:Efficient management of service Level Agreements which specify mutually-agreed understandings and expectations of service provision has been a subject of research for a few years. A critical issue in this area is for service consumers and service providers to effectively achieve Agreements on non-functional aspects of service provision, such as quality of service. However, this issue has not been well addressed, especially in the context of service composition provision which implies the establishment of a set of interrelated Agreements on quality of service between the service consumer and multiple service providers offering various services in the composition. There is a lack of supporting frameworks and techniques to automatically and dynamically achieve Agreements on quality of service constraints for individual services in a service composition, aiming at fulfilling composition's end-to-end quality of service requirements. This paper reports the authors' recent research in addressing this issue, using the agent technology. In this research, the service Level Agreements for a service composition are established through autonomous agent negotiation. To enable this, an innovative framework is proposed in which the service consumer is represented by a set of agents who negotiate quality of service constraints with the service providers for various services in the composition. This negotiation is well coordinated in order to achieve end-to-end quality of service requirements. Based on this framework, a new negotiation protocol is presented to support coordinated negotiation. A utility-function-based decision-making model is proposed based on which agents can proactively decide on the course of further actions. Moreover, this paper also contributes the novel design of the negotiation Web service on the service providers' side for the purpose of interoperability. Finally, the prototype implementation for the purpose of proof-of-concept is discussed.
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CSCWD - Towards Autonomous Service Level Agreement Negotiation for Adaptive Service Composition
2006 10th International Conference on Computer Supported Cooperative Work in Design, 2006Co-Authors: Jun Yan, Jian Ying Zhang, J. Lin, Mohan Baruwal Chhetri, Suk Keong Goh, Ryszard KowalczykAbstract:This paper reports innovative research aiming at supporting autonomous establishment and maintenance of service Level Agreements in order to guarantee end-to-end quality of service requirements for service composition provision. In this research, a set of interrelated service Level Agreements is established and maintained for a service composition, through autonomous agent negotiation. To enable this, an innovative framework is proposed in which agents on behalf of the service requestor and the service providers can negotiate service Level Agreements in a coordinated way. This framework also enables adaptive service Level Agreement re-negotiation in the dynamic and ever-changing service environment.
Ian Foster - One of the best experts on this subject based on the ideXlab platform.
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The Design, Usage, and Performance of GRUBER: A Grid Usage Service Level Agreement based BrokERing Infrastructure
Journal of Grid Computing, 2007Co-Authors: Catalin L. Dumitrescu, Ioan Raicu, Ian FosterAbstract:We present GRUBER, a G rid R esource U sage service Level Agreement (uSLA) based B rok ER ing infrastructure, aimed at addressing the challenging issues that can arise within virtual organizations (VOs) that integrate participants and resources spanning multiple physical administrative domains. In such environments, participants delegate to one or more VOs the right to use certain resources subject to local policy and service Level Agreements; each VO then uses those resources subject to VO policy. GRUBER supports the explicit representation, enforcement, and management of service Level Agreements (SLAs) concerning resource usage (uSLAs) that can serve as an objective organizing principle for controlled resource sharing in distributed systems. uSLAs express how resources must be used over various time intervals and represent a novelty for the Grid domain. This paper provides a detailed overview of the GRUBER infrastructure, the evolution of its design to improve scalability, specifically the distribution of the resource brokering service, and the extended support for dynamic environments. We also present various results achieved over time that demonstrate both the utility and performance of GRUBER under various application workloads and scenarios.
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the design usage and performance of gruber a g rid u sage service Level Agreement based b rok er ing infrastructure
Journal of Grid Computing, 2007Co-Authors: Catalin Dumitrescu, Ioan Raicu, Ian FosterAbstract:We present GRUBER, a Grid Resource Usage service Level Agreement (uSLA) based BrokERing infrastructure, aimed at addressing the challenging issues that can arise within virtual organizations (VOs) that integrate participants and resources spanning multiple physical administrative domains. In such environments, participants delegate to one or more VOs the right to use certain resources subject to local policy and service Level Agreements; each VO then uses those resources subject to VO policy. GRUBER supports the explicit representation, enforcement, and management of service Level Agreements (SLAs) concerning resource usage (uSLAs) that can serve as an objective organizing principle for controlled resource sharing in distributed systems. uSLAs express how resources must be used over various time intervals and represent a novelty for the Grid domain. This paper provides a detailed overview of the GRUBER infrastructure, the evolution of its design to improve scalability, specifically the distribution of the resource brokering service, and the extended support for dynamic environments. We also present various results achieved over time that demonstrate both the utility and performance of GRUBER under various application workloads and scenarios.
Rocco De Nicola - One of the best experts on this subject based on the ideXlab platform.
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slac a formal service Level Agreement language for cloud computing
IEEE ACM International Conference Utility and Cloud Computing, 2014Co-Authors: Rafael Brundo Uriarte, Francesco Tiezzi, Rocco De NicolaAbstract:The need of mechanisms to automate and regulate the interaction amongst the parties involved in the offered cloud services is exacerbated by the increasing number of providers and solutions that enable the cloud paradigm. This regulation needs to be defined through a contract, the so-called Service Level Agreement (SLA). We argue that the current solutions for SLA specification cannot cope with the distinctive characteristics of clouds. Therefore, in this paper we define a language, named SLAC, devised for specifying SLA for the cloud computing domain. The main differences with respect to the existing specification languages are: SLAC is domain specific, its semantics are formally defined in order to avoid ambiguity, it supports the main cloud deployment models, and it enables the specification of multi-party Agreements. Moreover, SLAC supports the business aspects of the domain, such as pricing schemes, business actions and metrics. Furthermore, SLAC comes with an open-source software framework which enables the specification, evaluation and enforcement of SLAs for clouds. We illustrate potentialities and effectiveness of the SLAC language and its management framework by experimenting with an Open Nebula cloud system.
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UCC - SLAC: A Formal Service-Level-Agreement Language for Cloud Computing
2014 IEEE ACM 7th International Conference on Utility and Cloud Computing, 2014Co-Authors: Rafael Brundo Uriarte, Francesco Tiezzi, Rocco De NicolaAbstract:The need of mechanisms to automate and regulate the interaction amongst the parties involved in the offered cloud services is exacerbated by the increasing number of providers and solutions that enable the cloud paradigm. This regulation needs to be defined through a contract, the so-called Service Level Agreement (SLA). We argue that the current solutions for SLA specification cannot cope with the distinctive characteristics of clouds. Therefore, in this paper we define a language, named SLAC, devised for specifying SLA for the cloud computing domain. The main differences with respect to the existing specification languages are: SLAC is domain specific, its semantics are formally defined in order to avoid ambiguity, it supports the main cloud deployment models, and it enables the specification of multi-party Agreements. Moreover, SLAC supports the business aspects of the domain, such as pricing schemes, business actions and metrics. Furthermore, SLAC comes with an open-source software framework which enables the specification, evaluation and enforcement of SLAs for clouds. We illustrate potentialities and effectiveness of the SLAC language and its management framework by experimenting with an Open Nebula cloud system.
