Tales from the C130 Horror Room: A Wireless Sensor Network Story in a Data Center

Ramona Marfievici, P. Corbalán, David Rojas, A. Mcgibney, S. Rea, D. Pesch
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引用次数: 7

Abstract

An important aspect of the management and control of modern data centers is cooling and energy optimization. Airflow and temperature measurements are key components for modeling and predicting environmental changes and cooling demands. For this, a wireless sensor network (WSN) can facilitate the sensor deployment and data collection in a changing environment. However, the challenging characteristics of these scenarios, e.g., temperature fluctuations, noise, and large amounts of metal surfaces and wiring, make it difficult to predict network behavior and therefore network planning and deployment. In this paper we report a 17-month long deployment of 30 wireless sensor nodes in a small data center room, where temperature, humidity and airflow were collected, along with RSSI, LQI, and battery voltage. After an initial unreliable period, a connectivity assessment performed on the network revealed a high noise floor in some of the nodes, which together with a default low CCA threshold triggered no packet transmissions, yielding a low PDR for those nodes. Increasing the CCA setting and relocating the sink allowed the network to achieve a reliability of 99.2% for the last eight months of the deployment, therefore complying with the project requirements. This highlights the necessity of using proper tools and dependable protocols, and defining design methodologies for managing and deploying WSNs in real-world environments.
来自C130恐怖室的故事:数据中心的无线传感器网络故事
现代数据中心管理和控制的一个重要方面是冷却和能源优化。气流和温度测量是模拟和预测环境变化和冷却需求的关键组成部分。为此,无线传感器网络(WSN)可以在不断变化的环境中方便传感器的部署和数据收集。然而,这些场景具有挑战性的特点,例如温度波动、噪声、大量金属表面和布线,使得预测网络行为变得困难,因此网络规划和部署也变得困难。在本文中,我们报告了在一个小型数据中心房间中长达17个月的30个无线传感器节点的部署,其中收集了温度,湿度和气流,以及RSSI, LQI和电池电压。在最初的不可靠期之后,在网络上执行的连通性评估显示,在一些节点中存在高本底噪声,这与默认的低CCA阈值一起触发无数据包传输,从而产生这些节点的低PDR。增加CCA设置和重新安置接收器使网络在部署的最后8个月实现了99.2%的可靠性,因此符合项目要求。这突出了使用适当的工具和可靠的协议的必要性,并定义了在现实环境中管理和部署wsn的设计方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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