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Service Level Agreements (SLA) are commonly used to define terms and conditions of service provisioning. WS-Agreement is an SLA specification that addresses the need of both producers and consumers of services to specify and negotiate terms and conditions of access to these services. This specification has gained wide acceptance in both the Grid computing and Web Services communities. WS-Agreement...
This paper theoretically argues and empirically evaluates how a firm's internal alignment and governance processes impact the service quality received from an external IT outsourcing provider. Using data from 154 firms, it is shown that good internal business/IT alignment leads to better and more accurate provider control processes which in turn improve service level agreements. The paper contributes...
To ensure Quality of Service (QoS) for data centers, it is critical to enforce a fair share of storage resources between competing users. Interposed schedulers are one of the most practical methods for performance isolation. Most fair queuing-based proportional sharing algorithms for existing interposed scheduler are variants of counterparts designed for network routers and may result in breaking...
Many companies offer physical products combined with on-line services. For example, product configuration, ordering, order tracking, and payments can be done on-line. The service part of the total offering (the composition) is typically composed of services offered by providers where performance of both the composition (provided by the company) and the input services (obtained from providers) is governed...
Service level agreements (SLAs) are used to manifest guarantees about certain functional and non-functional aspects of service execution. Service providers are confronted with a hard problem when trying to estimate reasonable QoS levels and other default settings for SLA templates. The insufficient use of formal service behavior descriptions, varying resource demands and a choice of configuration...
Resource management is a key challenge that service providers must adequately face in order to ensure their profitability. This paper describes a proof-of-concept framework for facilitating resource management in service providers, which allows reducing costs and at the same time fulfilling the quality of service agreed with the customers. This is accomplished by means of virtualization. Our approach...
With the emergence of new applications and requirements it became necessary to create new monitoring and reactive configuration mechanisms to try to meet the SLAs (service level agreements). In WDM (wavelength division multiplexing) optical networks, one way of trying to fulfill these agreements is by using pre-established protection paths. However, despite guaranteeing that traffic will be rapidly...
Web services are software applications that are published over the Web, and can be searched and invoked by other programs. New Web services can be formed by composing elementary services, such composite services are called Web service orchestrations. Quality of service (QoS) issues for Web service orchestrations deeply differ from corresponding QoS issues in network management. In an open world of...
This work presents a novel scheme for Service Level Agreements (SLAs) in a service-oriented architecture (SOA). An SLA is a contract that guarantees quality of service (QoS) between service providers and consumers. An SLA can be split into several parts for an SOA system which is consisting of different services. A split SLA is used to guarantee quality of services for one of services in an SOA system...
Web services can be composed to create complex business processes that span multiple organizations. quality of service (QoS) of such a process is guaranteed by a set of service level agreements (SLAs) between the service providers and the service consumers. Monitoring is required at every service provider and at the service consumer end in order to ensure satisfaction of the SLAs. Distributed monitoring...
New business infrastructures over the Internet pose a new set of traffic constraints. In particular, multimedia and interactive contents require guarantees of bandwidth and delivery time. The broad deployment and real-time nature of this class of applications require the provisioning of specific resources in the network to guarantee a certain level of quality of service (QoS). QoS techniques need...
In order to co-ordinate multiple resource providers in grid environment to meet a common objective, support for negotiation is needed to establish a contract between the user and the resource providers that clearly states the QoS required, restrictions on resource utilization and penalties during violation of the objective. Strength of the negotiation process mainly depends on the selection of resources...
Specifying clear quality of service (QoS) agreements between service providers and consumers is particularly important for the successful deployment of service-oriented architectures. The related challenges include correctly elaborating and monitoring QoS contracts (SLA: service level agreement) to detect and handle their violations. In this paper, first, we study and analyze existing SLA-related...
This keynote paper: presents a 21st century vision of computing; identifies various computing paradigms promising to deliver the vision of computing utilities; defines Cloud computing and provides the architecture for creating market-oriented Clouds by leveraging technologies such as VMs; provides thoughts on market-based resource management strategies that encompass both customer-driven service management...
Development of multimedia services, e.g. video on demand or IPTV and their flow transport over the IP multi-domain networks with quality of services (QoS) guarantees require appropriate management and control of QoS at service and also at the network level. The management and control system must first support cooperation between several independent network domains at service provisioning level while...
We developed a quality of service (QoS) management system to support service level management (SLM) for global enterprise services. The QoS management system is integrated with one of our enterprise services in a preproduction system, an identical system as the production system but in a test environment. Lab experiments showed that our integrated solution helps global enterprise services to better...
In this paper we discuss the use cases for monitoring of Web services for compliance with policies and service level agreements. In particular, the quality of service associated with Web service interactions and its monitoring rely on the proper use by both parties of related Web service protocols. This monitoring is best served by an event-centric model and an extensible scripting language, such...
Resource-sharing is one of the grid intrinsic properties enabling efficient usage of services by clients from many virtual organizations. In such an environment, the provisioning of quality of service requires mechanisms for the control of the concurrent access to resources and services, as well as protocols for the establishment of service level agreements between users and service providers. Nevertheless,...
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