A central point when integrating services concerns to the description, agreement and enforcement of the quality aspect of service interaction, usually known as Service Level Agreement (SLA). This paper presents a framework for SLA negotiation based on fuzzy sets. We propose (i) a request language for clients to describe quality preferences, (ii) a publication language for providers to define th...

Maintaining trust in cloud computing is a significant challenge due to the dynamic nature of cloud computing and the fragility of trust. Trust can be established by conducting successful transactions and meeting all the parameters of the Service Level Agreement (SLA) drawn up between two interacting parties. Trust can be maintained by continuous monitoring of these predefined SLA parameters. Th...

This paper discusses a framework for contract-based monitoring and adaptation with respect to customers’ goals seen as an important part of Service Level Agreement (SLA) contracts. Within standard SLA contracts concepts, as mutual agreements between service providers and users, we introduce Key Goal Indicators (KGIs). These are parameters that state how well service-based processes achieve the ...

The need for Service Level Agreements (SLAs) to supervise the consumption of services is increasing in business applications and Cloud scenarios due to the penalties that can apply for violation of SLA terms. Such a need for SLAs boosts the importance and complexity of SLA lifecycle supporting systems (SLA-driven solutions). In our work we propose to improve the current support to develop SLA-d...

End users can create kinds of mashups which combine various data-intensive services to form new services. The challenging issue of data-intensive service mashup is how to find service from a great deal of candidate services while satisfying SLAs. In this paper, Service-Level Agreement (SLA) consists of two parts, which are SLA-Q and SLA-T. SLA-Q (SLA-T) indicates the end-to-end QoS (transaction...

Providers of cloud environments must tackle the challenge of configuring their system to provide maximal performance while minimizing the cost of resources used. However, at the same time, they must guarantee an SLA (service-level agreement) to the users. The SLA is usually associated with a certain level of QoS (quality of service). As response time is perhaps the most widely used QoS metric, ...

Fifth-generation mobile networks (5G) promise higher flexibility compared with 4G, while also fulfilling the service-level agreement (SLA) [...]

Nowadays, most of the IT (Information Technology) and ICT (Information and Communication Technology) industries are practicing sustainability under green computing hoods. Users/Customers are also moving towards a new sustainable society. Therefore, while getting or providing different services from different ICT vendors, Service Level Agreement (SLA) becomes very important for both the service ...

A Service Level Agreement (SLA) defines the contract between a cloud provider and a cloud customer, detailing the resources being provided, the price the user will pay, and the quality of service (QoS) guarantees that the cloud provider ensures for the customer. If the QoS guarantees are not upheld, typically the cloud provider is assessed some penalties, such as payment credit for the customer...

In a previous column, I discussed how to build distributed systems from quality-of-service (QoS)-aware software components.1 I also described a design by which individual components can engage in QoS negotiation and perform admission control so that new incoming requests don’t violate committed QoS requirements.2 But what happens in a distributed application made up of several QoS-aware compone...