QoS management through service level agreements: a short overview

Abstract

The Internet protocol (IP) was created as a connectionless network layer protocol that takes no attempt to distinguish between various application types. Hence, the integration of a wide range of telecommunication services over the Internet is the main reason behind the need for the provision of quality of service (QoS) guarantees to end users. In such multiservice networks, resources are managed based on service level agreements (SLA), acknowledging different types of traffic in terms of bandwidth requirements, delay and other QoS parameters. An SLA is the documented result of a negotiation between a customer and a service provider that defines service characteristics, responsibilities and priorities of every party. An SLA may include statements about tariffing and billing, service delivery, and compensations. This paper provides a short overview of some aspects of quality of service, and identifies main issues and problems of defining and managing an SLA, based on its current standardization stage. Keywords

Quantitative Analysis and Performance Evaluation of Target-Oriented Replication Strategies in Cloud Computing

“…In all target-oriented replication strategies, QoS should integrate all the above-mentioned objectives (availability, reliability, performance, fault tolerance, load balancing, scalability, elasticity, consistency, and cost) to achieve the highest level of target achievement for optimal replication. The SLA contract represents the agreement between a service provider and its customers (agreed-upon guarantees) to guarantee assurance [6,136] to support the basic objectives like data availability, enhanced reliability, performance, etc. [137].…”

Client level QoS/SLA Management using UML and Ontology

“…An SLA is the documented result of a negotiation between a customer and a service provider, or between service providers themselves, that specifies the levels of availability, serviceability, performance, operation, or other attributes of the service. SLAs can help encourage customers to use new technologies and services as they provide a commitment from the service provider to guarantee specifies performance levels [2]. Also, UMLat the beginning was used as the integrated methodology for software development, but now it is used more frequently as the modeling language of various objects.…”