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首页> 外文期刊>IEEE Transactions on Parallel and Distributed Systems >COPA: Highly Cost-Effective Power Back-Up for Green Datacenters
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COPA: Highly Cost-Effective Power Back-Up for Green Datacenters

机译：COPA：绿色数据中心的高成本效益电源备份

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摘要

Traditional datacenters employ costly diesel generators (DG) and uninterrupted power supplies (UPS) to back up power. However, some or even all racks of a green datacenter can still be powered by renewable energy during grid power outages. This makes the utilization of the DGs and UPSs in green datacenters significantly lower than in traditional datacenters. In this paper, we propose a highly cost-effective power back-up (COPA) approach for green datacenters by leveraging the availability characteristics of renewable energy as well as grid power outages. COPA contributes three new techniques. The first technique, called least UPS capacity planning, determines the least rated power capability and runtime of the UPSs to guarantee the normal operations of a green datacenter during grid power outages. The second technique, named cooperative UPS/renewable power supply, employs UPS and renewable energy at the same time to supply power to each rack when grid power fails. The last one, dubbed renewable-energy-aware dynamic power management, controls the power consumption dynamically based on the available capacity of renewable energy and UPS. We build an experimental cluster consisting of 10 servers, and use four representative benchmarks as well as verified data about the availability characteristics of solar and wind energy to evaluate COPA. The results show that COPA reduces 47 percent and 70 percent of the power back-up cost for a solar energy powered datacenter and a wind energy powered datacenter, respectively. Moreover, COPA guarantees the applications Service Level Agreement (SLA) for at least 20 minutes (over 79 percent outages) and 56 minutes on average while enabling the back-up power to last for at least 2 hours and for 3 hours on average, which cannot be achieved by other under-provisioning power back-up approaches.
机译：传统的数据中心使用昂贵的柴油发电机（DG）和不间断电源（UPS）来备份电源。但是，在电网停电期间，绿色数据中心的某些甚至所有机架仍可以使用可再生能源供电。这使得绿色数据中心中DG和UPS的利用率大大低于传统数据中心。在本文中，我们通过利用可再生能源的可用性特征以及电网停电，为绿色数据中心提出了一种极具成本效益的电源备份（COPA）方法。 COPA贡献了三种新技术。第一项技术称为最小UPS容量规划，它确定了UPS的最小额定功率容量和运行时间，以确保电网停电期间绿色数据中心的正常运行。第二种技术称为协作式UPS /可再生电源，当电网停电时，它同时使用UPS和可再生能源为每个机架供电。最后一个被称为可再生能源意识的动态电源管理，它根据可再生能源和UPS的可用容量动态控制功耗。我们建立了一个由10台服务器组成的实验集群，并使用四个有代表性的基准以及有关太阳能和风能可用性特征的经过验证的数据来评估COPA。结果表明，对于太阳能供电的数据中心和风能供电的数据中心，COPA分别减少了47％和70％的备用电源成本。此外，COPA保证应用程序服务水平协议（SLA）至少持续20分钟（超过79％的中断）和56分钟，同时使备用电源至少持续2小时和3小时。其他配置不足的电源备份方法无法实现。

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