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Improved resiliency for inter-datacenter network connections

Abstract : Nowadays, Internet services as well as applications delivered using Cloud Computing are hosted in large datacenters. The Cloud Service Providers (CSP) commit to give to their customers access to their infrastructures with a high level of availability. They also target a high level of reliability of the data processed in their computing infrastructure. In order to respect those commitments, CSPs replicate the applications they run and the associated data in remote datacenters. From a CSP’s perspective, ensuring a high level of availability and reliability must be achieved while keeping the operational and capital expenditures as limited as possible. The coordinated operation of cloud applications from a set of remote datacenters requires using a performant and resilient connection scheme. In that extend, most CSPs deploy a mesh of private protected links rented from Internet service providers between their datacenters. A priori, such a connection scheme is costly and poorly flexible. Besides,from a CSP’s point of view, including a new datacenter in the desired network is an expensive approach. The goal of this PhD thesis is to allow CSPs to ensure their datacenter interconnections’ resiliency using a flexible and affordable connection scheme. In that extend, we take advantage of the fact that datacenters are most of the time connected to the Internet through several Internet service providers. We design an overlay network architecture, referred as Kumori. Kumori stands for "cloudy" in Japanese. This architecture aims to detect and to react quickly to link or node failures affecting inter-datacenter communications over the Internet. This overlay consists in routing inflection points placed at Internet Exchange Points (IXP). The Kumori architecture is managed by a central controller. After the description of the Kumori architecture, we evaluate its characteristics in terms of performance and resiliency. First, we compare Kumori’s performance to the performance achieved by RON (Resilient Overlay Network), another overlay network architecture aiming at enhancing resiliency over the Internet. We then, characterize the resiliency benefits provided by the Kumori architecture. To do so, we evaluate the number of disjoint paths that it can establish between the datacenters of two CSPs: Atos and Amazon. For the sake of this evaluation, we build a directed graph representation of the Internet using three public data sources in which the graph nodes represent the various operators’ geographical points of presence (PoP). Our Internet representation allows us to take into account the differences between network operators in the Internet. One of the major challenges we faced during this evaluation is related to the very large size of the graph we obtained, and to the algorithmic complexity of the path diversity search algorithm. At last, we discuss an evaluation of Kumori’s costs of operation in order to evaluate the economical potential of this architecture.
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https://pastel.archives-ouvertes.fr/tel-03690026
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Submitted on : Tuesday, June 7, 2022 - 5:41:33 PM
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  • HAL Id : tel-03690026, version 1

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Antoine Fressancourt. Improved resiliency for inter-datacenter network connections. Networking and Internet Architecture [cs.NI]. Télécom ParisTech, 2016. English. ⟨NNT : 2016ENST0071⟩. ⟨tel-03690026⟩

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