As the complexity of large-scale enterprise applications increases, providing performance verification through staging becomes an important part of reducing business risks associated with violating sophisticated service-level agreement (SLA). Currently, performance verification during the staging process is accomplished through either an expensive, cumbersome manual approach or ad hoc automatio...

Applying auctions to Web services selection and invocation calls for examination due to the unique features of Web services, such as interoperable machine-to-machine interactions and reenterable bargaining services. In this paper we propose a formal model for Web services-based auctions. Examining one-sided sealed auction type, we prove mathematically that service requestors’ risk preferences c...

Cloud computing has become a popular paradigm for implementing scalable computing infrastructures provided on-demand on a case-by-case basis. Selfmanageable Cloud infrastructures are required in order to comply with users’ requirements defined by Service Level Agreements (SLAs) and to minimize user interactions with the computing environment. Thus, adequate SLA monitoring strategies and timely ...

In Utility Computing business model, the owners of the computing resources negotiate with their potential clients to sell computing power. The terms of the Quality of Service (QoS) to be provided as well as the economic conditions are established in a Service-Level Agreement (SLA). There are situations in which providers must differentiate the SLAs in function of the type of Client that is will...

In service-oriented systems, negotiating service level agreements (SLAs) occupies a central role in the service usage cycle. It is during negotiations that parties are brought together in an interactive mechanism determined by the negotiation protocols. The choice and description of negotiation protocol determines the scope of information flow which in turn influences convergence upon an agreem...

Differentiated services (DifFServ) has been proposed as a scalable solution for the Internet QoS. Within the Dimerv architecture, premium services is a service class which is proposed for interactive real-time applications such as real-time voice and video over the Internet. In order to ensure the service quality of premium services, each DifFServ domain need to appropriately negotiate a servic...

We have constructed a teaching and research SLA test-bed using specially developed soft DiffServ routing nodes operating in a Linux environment. The test-bed, and the associated tools, is intended for various levels of study of SLA translation and mapping algorithms. It is instrumented to provide considerable insight into the DiffServ behavior. The software is more modular, flexible and easier ...

Multi-cloud applications, i.e. those that are deployed over multiple independent Cloud providers, pose a number of challenges to the security-aware development and operation. Security assurance in such applications is hard due to the lack of insights of security controls applied by Cloud providers and the need of controlling the security levels of all the components and layers at a time. This p...

The cloud computing paradigm provides a shared pool of resources and services with different models delivered to the customers through the Internet via an on-demand dynamically-scalable form charged using a pay-per-use model. The main problem we tackle in this paper is to optimize the resource provisioning task by shortening the completion time for the customers’ tasks while minimizing the asso...

An example for sourcing of virtualized services is “cloud bursting” as a deployment model in which applications run in a private cloud or data center and ‘burst’ into a non-private cloud when more computing capacity is needed [1],[2]. The availability of free burst capacity is not guaranteed, so ‘burst’ has a cheaper cost but comes with a higher risk that the Service Level Agreement (SLA) e.g. ...