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Automatically reconfigurable optical data center network with dynamic bandwidth allocation
Journal of Optics ( IF 2.1 ) Pub Date : 2021-10-26 , DOI: 10.1088/2040-8986/ac29cb
Xuwei Xue 1 , Kristif Prifti 1 , Bitao Pan 1 , Sai Chen 2 , Xiaotao Guo 1 , Fulong Yan 2 , Shaojuan Zhang 1 , Yu Wang 1 , Chongjin Xie 3 , Nicola Calabretta 1
Affiliation  

The rapid increasing traffic in data centers (DCs) puts tremendous pressure to the present multi-tier network architectures and electrical switching techniques. Switching traffic in the optical domain featuring ultra-high bandwidth, therefore, has been intensively investigated to build the high capacity data center networks (DCNs). To handle the variable traffic pattern in DCs, the network reconfigurability with adaptable optical bandwidth allocation is of key importance to flexibly assign the optical bandwidth. To this end, we propose and experimentally evaluate a software-defined networking enabled reconfigurable optical DCN with dynamic bandwidth allocation in this work, based on novel optical top of racks exploiting a wavelength selective switch. Experimental assessments show that the proposed solution can automatically reallocate the optical bandwidth in real-time to adapt the dynamic traffic pattern. Compared with the conventional optical DCN with static bandwidth provision, the end-to-end latency performance of the reconfigurable scheme with adaptable bandwidth allocation improves of 58.3% and the average packet loss decreases one order of magnitude. Moreover, the reconfigurable optical DCN features deterministic latency performance, with much lower time variations of packets delivery completion. Based on the experimental parameters, the simulation platform is also built to validate the good scalability of the proposed reconfigurable DCN. Numerical results illustrate the negligible performance degradation (11%) as the network scales from 2560 to 40 960 servers.



中文翻译:

具有动态带宽分配的自动可重构光数据中心网络

数据中心 (DC) 中快速增长的流量给当前的多层网络架构和电气交换技术带来了巨大压力。因此,以超高带宽为特征的光域中的交换流量已被深入研究以构建大容量数据中心网络(DCN)。为了处理 DC 中的可变流量模式,具有自适应光带宽分配的网络可重构性对于灵活分配光带宽至关重要。为此,我们在这项工作中基于利用波长选择开关的新型光学机架顶部,提出并通过实验评估了在这项工作中具有动态带宽分配的支持软件定义网络的可重构光学 DCN。实验评估表明,所提出的解决方案可以实时自动重新分配光带宽以适应动态流量模式。与传统的静态带宽提供的光DCN相比,自适应带宽分配的可重构方案的端到端时延性能提高了58.3%,平均丢包率降低了一个数量级。此外,可重构光 DCN 具有确定性延迟性能,数据包交付完成的时间变化要低得多。基于实验参数,还建立了仿真平台以验证所提出的可重构 DCN 的良好可扩展性。数值结果表明,当网络从 2560 台服务器扩展到 40 960 台服务器时,性能下降可以忽略不计 (11%)。

更新日期:2021-10-26
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