A Generic Platform for Conducting SLA Negotiations

Yaqub, Edwin; Wieder, Philipp; Kotsokalis, Constantinos; Mazza, Valentina; Pasquale, Liliana; Rueda, Juan Lambea; Gómez, Sergio García; Chimeno, Augustín Escámez

doi:10.1007/978-1-4614-1614-2_12

Cited by 18 publications

(5 citation statements)

References 11 publications

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“…This situation is similar to that in which a dealer is in the middle. It can use the concepts of meta-SLA (with the applicants) and sub-SLA (with the members) defined in Yaqub et al, 2011, andused in Rajan et al, 2006, to do so efficiently.…”

Section: Particularities Of the Implementation Of The Workflow Of Pur...mentioning

confidence: 99%

“…The best possible strategy consists in initially defining sufficiently abstract SLA to be able later to instantiate them to the potential new needs. It can be done by applying the method to define generic SLA provided in Yaqub et al, 2011. The corresponding steps and cases are shown in Table 2. SLA adaptations are not always possible.…”

Section: Particularities Of the Implementation Of The Workflow Of Pur...mentioning

confidence: 99%

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Software Services Delivered from the Cloud

Boiron¹,

Dussaux

2015

International Journal of Information Systems in the Service Sector

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Picture Archiving and Communication Systems (PACS), alongside Radiological Information Systems (RIS) are nowadays widely disseminated, proven useful, hospital information systems components. The "Région Sans Film" ("Filmless Region") program was launched in 2009 by the French ministry of health in order to help the generalization to all healthcare structures such as hospitals or general physician practices, of PACS, RIS, and archiving of medical images. It is done by means of a mutualized service platform whom building and running has been entrusted to an industrial consortium. This platform implements the latest technologies of medical image processing and of cloud computing. It is built in order to support service-oriented enterprise architecture composed of one main layer of software services. This natively scalable platform is innovative because it is the first one which contains all the materials for the implementation of all services in the cloud. The corresponding SLA are defined in order to be adaptable to the needs of further health structures which could later join the platform by participating in its mutualized purchasing. The goal is not only to share the costs but also to deliver new images sharing services. New business processes/services around sharing of images such as teleradiology or access to the images produced in hospitals to the general practitioners are defined towards the exercise of real filmless radiology.

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Section: Particularities Of the Implementation Of The Workflow Of Pur...mentioning

confidence: 99%

Section: Particularities Of the Implementation Of The Workflow Of Pur...mentioning

confidence: 99%

Software Services Delivered from the Cloud

Boiron¹,

Dussaux

2015

International Journal of Information Systems in the Service Sector

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“…Currently, a self-service portal provides singleclick provisioning of pre-configured services. In future, agents will be introduced to automatically negotiate SLAs embodying desired qualities of procured services, as outlined in our recent research (Yaqub et al, 2011) (Yaqub et al, 2012). GWDG Cloud service customers are divided in two categories.…”

Section: Performance Management Scenarios At Gwdgmentioning

confidence: 99%

Practical Aspects for Effective Monitoring of SLAs in Cloud Computing and Virtual Platforms

Jehangiri¹,

Yaqub

Yahyapour

2013

Proceedings of the 3rd International Conference on Cloud Computing and Services Science

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Cloud computing is transforming the software landscape. Software services are increasingly designed in modular and decoupled fashion that communicate over a network and are deployed on the Cloud. Cloud offers three service models namely Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS), and Softwareas-a-Service (SaaS). Although this allows better management of resources, the Quality of Service (QoS) in dynamically changing environments like Cloud must be legally stipulated as a Service Level Agreement (SLA). This introduces several challenges in the area of SLA enforcement. A key problem is detecting the root cause of performance problems which may lie in hosted service or deployment platforms (PaaS or IaaS), and adjusting resources accordingly. Monitoring and Analytic methods have emerged as promising and inevitable solutions in this context, but require precise real time monitoring data. Towards this goal, we assess practical aspects for effective monitoring of SLA-aware services hosted in Cloud. We present two real-world application scenarios for deriving requirements and present the prototype of our Monitoring and Analytics framework. We claim that this work provides necessary foundations for researching SLA-aware root cause analysis algorithms under realistic setup.

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“…In cloud computing, SLAs are used to ensure that service quality is kept at acceptable levels [8]. An SLA management component may consist of several components: discovery, (re-)negotiation, pricing, scheduling, risk analysis, monitoring, SLA enforcement and dispatching [7], where SLA negotiation determines the cardinality of parties involved, their roles, the visibility of the offers exchanged and so on [30]. Furthermore, Ron et al in [9] define the SLA life cycle in three phases: creation phase, operation phase and removal phase.…”

Section: Related Workmentioning

confidence: 99%

Structural Optimization of Reduced Ordered Binary Decision Diagrams for SLA Negotiation in IaaS of Cloud Computing

Yahyapour

Yaqub

et al. 2012

Service-Oriented Computing

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In cloud computing, an automated SLA is an electronic contract used to record the rights and obligations of service providers and customers for their services. SLA negotiation can be a time-consuming process, mainly due to the unpredictable rounds of negotiation and the complicated possible dependencies among SLAs. The operation of negotiating SLAs can be facilitated when SLAs are translated into Reduced Ordered Binary Decision Diagrams (ROBDDs). Nevertheless, an ROBDD may not be optimally structured upon production. In this paper, we show how to reduce the number of 1-paths and nodes of ROBDDs that model SLAs, using ROBDD optimization algorithms. In addition, we demonstrate the reduction of 1-paths via the application of Term Rewriting Systems with mutually exclusive features. Using the latter, ROBDDs can be generated accurately without redundant 1-paths. We apply the principles onto the negotiation of IaaS SLAs via simulation, and show that negotiation is accelerated by assessing fewer SLA proposals (1-paths), while memory consumption is also reduced.

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A Generic Platform for Conducting SLA Negotiations

Cited by 18 publications

References 11 publications

Software Services Delivered from the Cloud

Software Services Delivered from the Cloud

Practical Aspects for Effective Monitoring of SLAs in Cloud Computing and Virtual Platforms

Structural Optimization of Reduced Ordered Binary Decision Diagrams for SLA Negotiation in IaaS of Cloud Computing

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