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.

Modelling End-to-end Quality-of-Service for Transaction-Based Services in Multi-Domain Environments

Abstract: Next-generation service offerings will integrate information from multiple interconnected servers. For the commercial success of these services, the ability to deliver good end-to-end Quality-of-Service (QoS) is crucial. Today, no mature solutions exist for the problem of realizing high and guaranteed end-to-end QoS for transaction-based services in multi-domain environments. Service Level Agreements (SLAs) are a well-recognized concept to obtain QoS guarantees, but currently no satisfactory solutions exist for SPs to determine the set of combinations of per-domain SLAs that they need to negotiate with the other domain owners to deliver the desired end-to-end QoS. To this end, in this paper we introduce the new concept called SLA negotiation space, i.e. the set of combinations of per-domain SLAs that SPs need to negotiate with other domain owners to realize desired end-to-end QoS levels. In addition, to identify the SLA negotiation space, we propose a modelling framework to quantify the complex relation between the per-domain SLA parameters and the end-to-end QoS. The practical usefulness of our results is demonstrated by a realistic example.

Quality of service enabled database applications

Abstract: In today's enterprise service oriented software architectures, database systems are a crucial component for the quality of service (QoS) management between customers and service providers. The database workload consists of requests stemming from many different service classes, each of which has a dedicated service level agreement (SLA). We present an adaptive QoS management that is based on an economic model which adaptively penalizes individual requests depending on the SLA and the current degree of SLA conformance that the particular service class exhibits. For deriving the adaptive penalty of individual requests, our model differentiates between opportunity costs for underachieving an SLA threshold and marginal gains for (re-)achieving an SLA threshold. Based on the penalties, we develop a database component which schedules requests depending on their deadline and their associated penalty. We report experiments of our operational system to demonstrate the effectiveness of the adaptive QoS management.

Service level management system

Abstract: A service level management (SLM) system where the system learns the structure of a web application, monitors the operation of the application, and controls the processing of incoming requests to achieve optimal performance as defined in a service level agreement (SLA). The system is operative for example in enterprise web applications and in enterprise data centers that deploy web applications and optimally is capable of controlling and maintaining a level of service of web applications.

Ontology for Contract Negotiations in an Agent-based Grid Resource Management System

Abstract: Our research (the Agents in Grid; AiG project) concerns the development of an agent-based Grid middleware, in which (a) agents work in teams (each team is to be managed by the LMaster agent), (b) all meta-information is ontologically demarcated and semantically processed (with all team information stored in and managed by the Client Information Center; CIC infrastructure represented by the CIC agent), and (c) an economic model is to be based on autonomic Service Level Agreement (SLA) negotiations and Quality of Service (QoS) monitoring.

A network slicing prototype for a flexible cloud radio access network

Abstract: The next 5G infrastructure is expected to serve a multitude of services with heterogeneous requirements, which might be potentially managed by multiple Mobile Virtual Network Operators (MVNOs) that share the same network infrastructure. The new emerging technologies, such as i) Software Defined Networking (SDN), ii) Network Function Virtualization (NFV) and iii) Network Slicing, where physical resources are partitioned and allocated in an isolated manner to a set of services or to MVNOs according to a specific Service Level Agreement (SLA), are seen as the key enabling approaches to fulfill the diversity of requirements of 5G services in a cost-effective manner. In this paper, we design and prototype a network slicing solution, which we have developed in a Cloud-RAN (C-RAN) infrastructure based on the Open Air Interface (OAI) platform and FlexRAN SDN controller. The aim of our work is to validate the feasibility of the prototype in handling the creation and configuration of network slices on-demand, taking into account some requirements that are elaborated from SDN-based slicing applications. By means of emulations, we show that our prototype reacts well to the inputs coming from the SDN application and is finally capable of providing isolation among multiple slices in a dynamic fashion.