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Service Level Agreement (SLA) is gaining more and more interest since the dynamic aspect of the cloud computing can adversely influence the guarantee of the Quality of Service (QoS). Proving an SLA violation is considered to be a complex operation to the cloud consumer. This task gets more and more difficult to the consumers as they use services from multiple providers, each with its own monitoring...
Service Oriented Architecture (SOA) and Software Product Line (SPL) have individually proven to be Software Engineering concepts, which are creating values for developing software systems. While SOA is being used for developing applications from an orchestration of web services, SPL has ability to prepare core sets of assets and manage with variable components. The combination of SOA and SPL has highlighted...
To date, cloud service consumers usually cannot obtain customized quality guarantees according to their specific business constraints. However, on-demand service provisioning, a large number of services with multiple quality parameters, and a plethora of consumers prevent manual negotiations that are typically conducted in face-to-face meetings. Therefore, the design and realization of appropriate...
Managing and applying penalties has become a critical issue for Cloud Computing. In this paper we investigate this issue and present the most frequently used definitions of SLA penalty functions. We identify the characteristics of these functions highlighting their strengths and weaknesses. Then we propose a Novel Penalty Model for calculating the penalty cost of the violations, and present a formalization...
A Service Level Agreement (SLA) is a legal contract between parties to ensure the Quality of Service (QoS). It specifies one or more service level objectives (SLO), to ensure that the QoS delivered has met customer expectations. However, It becomes hard to guarantee QoS levels and detect SLA violations. Therefore, we propose to use MDE (Model Driven Engineering) to express the SLA contract requirements...
Cloud Computing (CC) marks a new step towards IT infrastructure dematerialization. Cloud provides IT resources, software and hardware, remotely accessible, as a service. The adoption of this model raises a number of challenges, particularly with regard to Quality of the provided services. To cope with a highly dynamic environment such as the CC, it is essential to determine in real time Quality of...
The EU challenges for the future energy systems will change the scene of the energy systems in Europe. A transition from centralized controlled power network to customer oriented Smart Grid operating in distributed and deregulated energy market poses several regulatory, organizational and technical challenges. In such a market scenarios, multiple stakeholders provide services to produce and deliver...
Cloud computing is a promising trend for future computing and data storage based on its outstanding scale and efficiency advantage. Cloud providers should provide reliable and stable resource and services to customers while maintaining service level agreements (SLAs). Establishing a cloud platform that is easy to deploy and easy to use, and developing an efficient monitoring tool to detect SLA violations...
An Service Level Agreement (SLA) is a contract between service provider and consumer, and includes appropriate actions to be taken upon violation of the contractual obligations. To ensure the negotiation on an SLA is reasonable by reference the measured history data. The paper proposes a feasible Web Service Level Agreement (WS-SLA) Establishing Framework, which can flexible define trustable SLA requirements...
Smooth and reliable operation of the future Smart Grid requires addressing coordination and interoperability issues. In Smart Grid, the coordination of new actors and monitoring of new business processes, such as Active Demand and Electric Vehicles is non-trivial. These new actors and related business processes change the landscape of power grid from traditional passive Demand Side Management of loads...
The challenge for the future Smart Grids is to improve the energy efficiency and enable groups of stakeholders to offer services to customers. An intelligent agent-based ICT infrastructure supplementing SCADA systems is required to support such perspectives of power grids. This paper focus on describing a novel approach, using Service Level Agreements (SLAs) as a tool, for improving coordination between...
The ongoing trend towards a global services economy creates considerable market opportunities for various stakeholders. A service intermediary who offers complex services to customers and consumes services from suppliers and thus creates a service value network, faces the challenge of adhering to agreed service levels while minimizing associated costs, risks and potential penalties. Starting from...
Cloud computing systems promise to offer subscription-oriented, enterprise-quality computing services to users worldwide. With the increased demand for delivering services to a large number of users, they need to offer differentiated services to users and meet their quality expectations. Existing resource management systems in data centers are yet to support Service Level Agreement (SLA)-oriented...
Many global distributed cloud computing applications and services running over the Internet, between globally dispersed clients and servers, will require certain levels of Quality of Service (QoS) in order to deliver and give a sufficiently smooth user experience. This would be essential for real-time streaming multimedia applications like online gaming and watching movies on a pay as you use basis...
Future Smart Grids have to meet high expectations from our societies on improved energy efficiency and sustainability. However, system uptake and acceptance will to a large extent depend on the perceived trust by different stakeholders. In the paper we address issues related to engineering of trustworthy systems. This type of Engineering will be grounded in reliable models of interoperability. A key...
Future powers system is considering huge flux of information flow due to increase in Renewable Energy Sources. Due to the limited monitoring and management of SCADA systems, inclusion of DER at local distribution level is a challenging task for the Smart Grid. We discuss the non-functional requirement aspects and their implication in trustworthy systems. The paper also illustrates an engineering approach...
According to ITU database about telecommunication regulatory bodies, regulators were responsible to monitor the quality of services in about 84% countries across the world in 2005; furthermore, regulators assigned the quality borders in about 76% of countries. In this paper we use metamodeling strategy to analyze and model the required processes for QoS/SLA management system. This model is developed...
Business-to-Business (B2B) workflow/service interoperation across Virtual Organisations (VOs) brings about novel business scenarios. In these scenarios, parts of workflows (or services) corresponding to different partners can be aggregated in a producer-consumer manner, leading to hierarchical structures of added value interpreted as service value chains. Service Level Agreements (SLAs), which are...
In this paper we propose a framework for proactive SLA negotiation that integrates this process with dynamic service discovery and, hence, can provide integrated runtime support for both these key activities which are necessary in order to achieve the runtime operation of service based systems with minimised interruptions. More specifically, our framework discovers candidate constituent services for...
One of the main steps of service assurance is service monitoring using Key Performance Indicators (KPIs) and Service Level Agreements (SLAs). We show an approach for service modeling, first starting with an abstract service model that depends on the network. And then, we show how a corresponding model can be realized using a domain specific language. This solution is able to condense various sources...
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