Augmenting data center networks with multi-gigabit wireless links
Augmenting data center networks with multi-gigabit wireless links
复制标题
DOI：
10.1145/2018436.2018442
复制
发表时间：
2011-08
期刊：
影响因子：
--
通讯作者：
D. Halperin;Srikanth Kandula;J. Padhye;P. Bahl;D. Wetherall
中科院分区：
文献类型：
--
作者：
D. Halperin;Srikanth Kandula;J. Padhye;P. Bahl;D. Wetherall
目前正在兴起的60 GHz无线技术具有以低成本提供密度高、速度极快的连接的潜力。在本文中，我们将探讨如何使用它来缓解超订用数据中心(DC)网络中的热点。通过原型设备的实验，我们表明DC环境非常适合部署60 GHz链路，而不是考虑干扰和链路可靠性。使用定向天线，许多无线链路可以在架顶式(ToR)交换机上以多Gbps的速率同时运行。有线DC网络可以用来避免几个常见的无线问题。通过分析四个实际应用的DC流量的生产轨迹，我们表明，以无线通道的形式向有线DC网络添加少量网络容量可以提高性能。然而，为了具有重要的价值，我们发现需要一跳间接路由。根据我们的60 GHz实验和DC流量分析，我们提出了一种使用DC流量水平来选择和添加通道到有线DC网络的设计方案。跟踪驱动的评估表明，在1：2超订用网络上运行具有可预测流量工作负载的网络受限数据中心应用程序，在95%的情况下可以将速度提高45%，每台ToR交换机只需一台无线设备。对于两台设备，在40%的情况下，性能与非超订用网络相同。
The 60 GHz wireless technology that is now emerging has the potential to provide dense and extremely fast connectivity at low cost. In this paper, we explore its use to relieve hotspots in oversubscribed data center (DC) networks. By experimenting with prototype equipment, we show that the DC environment is well suited to a deployment of 60GHz links contrary to concerns about interference and link reliability. Using directional antennas, many wireless links can run concurrently at multi-Gbps rates on top-of-rack (ToR) switches. The wired DC network can be used to sidestep several common wireless problems. By analyzing production traces of DC traffic for four real applications, we show that adding a small amount of network capacity in the form of wireless flyways to the wired DC network can improve performance. However, to be of significant value, we find that one hop indirect routing is needed. Informed by our 60GHz experiments and DC traffic analysis, we present a design that uses DC traffic levels to select and adds flyways to the wired DC network. Trace-driven evaluations show that network-limited DC applications with predictable traffic workloads running on a 1:2 oversubscribed network can be sped up by 45% in 95% of the cases, with just one wireless device per ToR switch. With two devices, in 40% of the cases, the performance is identical to that of a non-oversubscribed network.