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Theses

Sûreté de fonctionnement et provisionnement éco-énergétique dans les centres de données virtualisés IaaS

Abstract : Cloud computing allows users to exploit services such as infrastructures, platforms, applications, ...This allows a considerable cost and time saving since users do not need buying and managing of equipment. Moreover, they just pay the resources used (pay-as-you go). With the increasing large-scale applications and the need to store huge quantities of data, data centers have been widely deployed. However, studies have shown the under utilization of resources. Therefore, Cloud providers resort to virtualization technologies that are adopted by data center architectures and virtualized data centres have been deployed. A Virtualized Data Center is a data center where some or all of the hardware (e.g, servers, routers, switches, and links) are virtualized by using software called hypervisor that divides the equipment into multiple isolated and independent virtual instances (e.g virtual machines (VMs)). However, equipment performance can be mitigated due to several phenomena such as software aging. In this thesis, we focus on performance evaluation of two components in the data centers which are the virtualized server and the virtual switch, by usingmodeling formalisms. The first contribution concerns performability modeling and analysis of server virtualized systems subject to software aging, software rejuvenation and implements an energy management policy. A modular approach based on SRNs is proposed to investigate dependencies between several server virtualized modules. Numerical analysis shows how workload with bursty nature impacts performability metrics. This can handle decision making related to rejuvenation scheduling algorithms and to select the suitable rejuvenation mechanism. The second contribution concerns virtual switch (VS) which is considered as key element in data center networks since it achieves the communication between virtual machines. An analytical queueing model with batch arrivals and server vacations is proposed to evaluate VS performance with several network interface cards and several CPU cores. Performance metrics are obtained as a function of two proposed batch acceptance strategies and mean batch size. Numerical results aremeaningful when sizing virtual switch resources.
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https://tel.archives-ouvertes.fr/tel-03477433
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Submitted on : Monday, December 13, 2021 - 2:18:27 PM
Last modification on : Wednesday, December 15, 2021 - 3:19:27 AM

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  • HAL Id : tel-03477433, version 1

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Zeineb Tayachi. Sûreté de fonctionnement et provisionnement éco-énergétique dans les centres de données virtualisés IaaS. Modélisation et simulation. Conservatoire national des arts et metiers - CNAM; Université de Tunis El Manar, 2021. Français. ⟨NNT : 2021CNAM1292⟩. ⟨tel-03477433⟩

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