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Service-level agreement

About: Service-level agreement is a research topic. Over the lifetime, 4358 publications have been published within this topic receiving 75333 citations. The topic is also known as: SLA.


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Patent
15 Sep 2003
TL;DR: In this paper, the authors present a method, system, and program for managing a network providing Input/Output (I/O) paths between a plurality of host systems and storage volumes in storage systems.
Abstract: Provided are a method, system, and program for managing a network providing Input/Output (I/O) paths between a plurality of host systems and storage volumes in storage systems. An application service connection definition is provided for each connection from a host to a storage volume. At least one service level guarantee definition is provided indicating performance criteria to satisfy service requirements included in at least one service level agreement with at least one customer for network resources. Each service level guarantee definition is associated with at least one application service connection definition. Monitoring is performed as to whether Input/Output (I/O) requests transmitted through the multiple I/O paths satisfy performance criteria indicated in the service level guarantee definition associated with the I/O paths.

41 citations

Journal ArticleDOI
TL;DR: This approach is the first to provide a clear separation between service computation and discovery/instantiation/binding, and to offer a formal framework that is independent of the SOA middleware components that act as service registries or brokers, and the protocols through which bindings and invocations are performed.
Abstract: We propose a formal operational semantics for service discovery and binding. This semantics is based on a graph-based representation of the configuration of global computers typed by business activities. Business activities execute distributed workflows that can trigger, at run time, the discovery, ranking and selection of services to which they bind, thus reconfiguring the workflows that they execute. Discovery, ranking and selection are based on compliance with required business and interaction protocols and optimisation of quality-of-service constraints. Binding and reconfiguration are captured as algebraic operations on configuration graphs. We also discuss the methodological implications that this model framework has on software engineering using a typical travel-booking scenario. To the best of our knowledge, our approach is the first to provide a clear separation between service computation and discovery/instantiation/binding, and to offer a formal framework that is independent of the SOA middleware components that act as service registries or brokers, and the protocols through which bindings and invocations are performed.

41 citations

Journal ArticleDOI
TL;DR: This work considers that a typical electronic-layer demand requires only a fraction of the capacity of the single wavelength bandwidth and investigates a new algorithm for traffic grooming of sub-wavelength connections in an optical mesh network, relying on the knowledge of the holding time of connection requests to exploit lightpath capacity.
Abstract: Progress in network technologies and protocols is paving the road towards flexible optical transport networks, in which dynamic leasable circuits could be set up and released on a short-term basis according to customers requirements. Recently, new solutions for automated network management promise to allow customers to dinamically specify the terms of the Service Level Agreement (SLA) to be guaranteed by the service provider. Since this new information is made available, we propose to exploit the knowledge of connection holding time, among the other Service Level Specifications (SLS), to improve the routing efficiency. In this work, we consider that a typical electronic-layer (e.g., SDH or MPLS) demand requires only a fraction of the capacity of the single wavelength bandwidth and we investigate a new algorithm for traffic grooming of sub-wavelength connections in an optical mesh network. We rely on the knowledge of the holding time of connection requests to exploit lightpath capacity and hence to achieve significant reduction in blocking probability for the traffic grooming problem. Our new methodology is applied on a typical US nation-wide network and results are compared with those given by previous known approaches.

41 citations

Proceedings Article
07 Feb 2010
TL;DR: A Cloud computing architecture focusing SAAS is proposed, which provides general specifications for SaaS design and for services implemented in it.
Abstract: The availability of high speed internet has diversified the way we used to intermingle with each other. The emergence of social networks and interactive web applications has left a dent in existing software and service delivery models. Software vendors now not only focus on functionality but also have to cater delivery model of their software. On-demand and ubiquitous accessibility has become an inimitable selling point for software vendors. In the last few years we have witnessed a term “Cloud computing” thronging blogs and search engines. Cloud computing is on-demand service delivery; services ranging from Infrastructure, Platform and Software. With the materialization of Amazon Cloud Computing Service we have seen exponential increase in interest of business as well as research community in Cloud computing Orchestra. Now technological oracles are offering their software in Cloud as Software as a Service (SaaS). Every service provider is laying on line to gain competitive advantage over each other, there is need to delineate development guideline for SaaS. Without any doubt security is one of the main concerns for Cloud computing environment but unfortunately in the mist of security issues general recommendations for efficient Cloud has faded away. In this paper we have proposed a Cloud computing architecture focusing SaaS, which provides general specifications for SaaS design and for services implemented in it.

41 citations

01 Jan 2008
TL;DR: This paper proposes a SOA system, named Service Level Agreement Monitor (SALMon), for monitoring and adapting SOA Systems at run time, based on monitoring the services for detecting Servicelevel Agreement (SLA) violations.
Abstract: Adaptability is a key feature of Service-Oriented-Architecture (SOA) Systems. These systems must evolve themselves in order to ensure their initial requirement as well as to satisfy arising new ones. In SOA Systems there are a lot of dependencies between services, but each service is an independent element of the system. In this situation it is necessary not only ensuring that the system fulfils its requirements but also that every system satisfies its own requirements, and dynamically adapting the system when some of them cannot be ensured. In this paper we propose a SOA system, named Service Level Agreement Monitor (SALMon), for monitoring and adapting SOA Systems at run time. SALMon is based on monitoring the services for detecting Service Level Agreement (SLA) violations. The SALMon architecture is composed of three types of components: Monitors, which are composed of measure instruments themselves; the Analyzer, which checks the SLA rules; and the Decision Maker that performs corrective actions to satisfy SLA rules again. These three types of components are mostly technology-independent and the act as service inside of a SOA system making our architecture very scalable and comfortable for its purpose.

41 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202339
2022106
2021183
2020233
2019237
2018255