Thèse soutenue

FR
Auteur / Autrice : Ilhem Fajjari
Direction : Guy Pujolle
Type : Thèse de doctorat
Discipline(s) : Informatique
Date : Soutenance en 2012
Etablissement(s) : Paris 6

Mots clés

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Résumé

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In Cloud computing, Cloud providers must possess efficient techniques to supply clients with computational resources over scalable network. Optimal and speed provisioning algorithm is fundamental to achieve this goal. In this thesis, we address the problematic of resource provisioning within Cloud backbone network infrastructure. Our research aims to optimise the allocation of virtual networks over a physical network while meeting the end user' requirements and maximising the Cloud provider revenue. The problem of virtual network provisioning is NP-hard. To overcome the great complexity involved, we propose several heuristic provisioning strategies and we tackle the problem in three stages. In the first stage, we consider a static embedding where peak demand is considered and no reconfiguration mechanisms are allowed. We propound a new scalable embedding strategy named VNE-AC based on the Ant Colony metaheuristic. In the second stage, we build on the work carried out in the first stage by integrating reconfiguration mechanisms in order to improve resource usage and enhance Cloud provider profitability. This lead us to propose a new greedy Virtual Network Reconfiguration algorithm VNR. Finally, in the third stage, we consider an adaptive embedding taking into consideration circulating traffic in order to avoid resource over-provisioning led by peak-demand allocation. We propose an adaptive virtual network resource allocation strategy named Adaptive-VNE to deal with the complexity and the inefficiency of resource allocation. Obtained results prove the efficiency of proposed strategies.