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In this paper, we investigate an economically motivated session-aware admission-control model for Internet servers subjected to future NGN session-oriented services. Our fundamental observation is that it is sometimes desirable to reject new sessions from some customers, so that others may be completed and thereby generate some revenue for the operator. Conversely, most of the already existing admission-control...
Fault tolerance can be defined as the capability of a system or a component to continue normal operation, despite the occurrence of a hardware or a software fault. Frameworks providing a fault tolerant service take advantage of resources' redundancy to provide high availability capabilities. One of the critical challenges that led to this work is the observation that the existing fault tolerance frameworks...
For an improved QoS provisioning, operators are strongly concerned both with the availability and the reliability of their performance critical servers. Among these entities, we mention the firewalls used to filter the offered network traffic to the operator's information system as well as the end processing servers which service each incoming client request. In this work, we advocate and evaluate...
Under overload condition, a processing server contributes to the poor QoS through sustaining heavy request queuing delays and prolonged processing time. Admission control is a well known mean to prevent a server overload. Most state of the art research advocate session oblivious mechanisms where the dropping of the requests pertaining to an accepted session can occur at any time during the session...
Fault-tolerant frameworks provide highly available services by means of fault detection and fault recovery mechanisms. These frameworks need to meet different constraints related to the fault model strength, performance, and resource consumption. One of the factors that led to this work is the observation that current fault-tolerant frameworks are not always adapted to existing Internet services....
Internet server clustering has been widely used by operators to improve the scalability and the availability of the rendered services under heavy load condition. Load balancing is a well known mean to optimize the usage of the cluster available resources by fairly allocating them to the offered network traffic. Most state-of-the-art research advocate either session oblivious or coarse grained session...
While a lot of researches focused on how to efficiently spread the offered network load on the available cluster resources, less interest has been granted to the impact of the used mechanisms on the reliable execution of the upper layer services. On the other hand, emerging NGN services as well as some of the already familiar services involve multiple flows during the lifespan of a single end- to-end...
Today's Internet models are concerned with both of the quality and the availability of a given service. Current fault tolerant frameworks need to support consistent transport and application level failover mechanisms. Transport protocols relay on an explicit association between a service and its physical location for the wired Internet. Thus, when a host fails, the end-to-end flow terminates. In this...
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