Daniel Halperin
Paramvir Bahl
David Wetherall
Abstract
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.
Supplemental Material
- M. Al-Fares et al. A scalable, commodity data center network architecture. In SIGCOMM, 2008. Google Scholar
Digital Library
- M. Al-Fares et al. Hedera: Dynamic flow scheduling for data center networks. In NSDI, 2009. Google ScholarDigital Library
- S. Alalusi. CMOS multi-antenna systems at 60GHz. In Communications Design Conference, July 2004.Google Scholar
- M. Alizadeh et al. DCTCP: Efficient packet transport for the commoditized data center. In SIGCOMM, 2010. Google ScholarDigital Library
- T. Benson et al. The case for fine-grained traffic engineering in data-centers. In WREN, 2010. Google ScholarDigital Library
- T. Benson et al. Network traffic characteristics of data centers in the wild. In IMC, 2010. Google ScholarDigital Library
- N. Farrington et al. Helios: A hybrid electrical/optical switch architecture for modular data centers. In SIGCOMM, 2010. Google ScholarDigital Library
- A. Greenberg et al. VL2: A scalable and flexible data center network. In SIGCOMM, 2009. Google ScholarDigital Library
- C. Guo et al. BCube: High performance, server-centric network architecture for data centers. In SIGCOMM, 2009. Google ScholarDigital Library
- IEEE P802.11ad/D0.1: Enhancements for very high throughput in the 60GHz band. Draft 0.1, June 2010.Google Scholar
- M. Isard et al. Quincy: fair scheduling for distributed ocmputing clusters. In SOSP, 2009. Google ScholarDigital Library
- K. Jain et al. Impact of interference on multi-hop wireless network performance. In MOBICOMM, 2003. Google ScholarDigital Library
- S. Kandula et al. Walking the tightrope: responsive yet stable traffic engineering. In SIGCOMM, 2005. Google ScholarDigital Library
- S. Kandula et al. The nature of datacenter traffic: Measurements and analysis. In IMC, 2009. Google ScholarDigital Library
- S. Kandula, J. Padhye, and P. Bahl. Flyways to de-congest data center networks. In HotNets, Nov. 2009.Google Scholar
- LightPointe. http://www.lightpointe.com/.Google Scholar
- X. Liu et al. DIRC: Increasing indoor wireless capacity using directional antennas. In SIGCOMM, 2009. Google ScholarDigital Library
- T. Manabe et al. Effects of antenna directivity on indoor multipath propagation characteristics at 60GHz. In PIMRC, 1995.Google Scholar
- V. Navda et al. MobiSteer: Using steerable beam directional antenna for vehicular network access. In MobiSys, 2007. Google ScholarDigital Library
- G. Nikolaidis et al. (Poster) Cone of silence: Adaptively nulling interferers in wireless networks. In SIGCOMM, 2010. Google ScholarDigital Library
- The ns-3 network simulator. http://www.nsnam.org/.Google Scholar
- K. Ramachandran et al. 60GHz data-center networking: Wireless Rightarrow worry less? Technical report, NEC, 2008.Google Scholar
- T. S. Rappaport. Wireless Communications: Principles and Practice. Prentice-Hall, 2002. Google ScholarDigital Library
- Sayana Networks.Google Scholar
- A. Sheth et al. Geo-fencing: Confining Wi-Fi coverage to physical boundaries. In Pervasive, 2009. Google ScholarDigital Library
- SiBeam. http://sibeam.com/whitepapers/.Google Scholar
- SiBeam. http://www.earthtimes.org/articles/press/generation-solutions-ces-2011,1604984.html.Google Scholar
- A. Singla et al. Proteus: A topology malleable data center network. In HotNets, 2010. Google ScholarDigital Library
- Terabeam Wireless. http://www.terabeam.com/.Google Scholar
- G. Wang et al. c-Through: Part-time optics in data centers. In SIGCOMM, 2010. Google ScholarDigital Library
- Wireless Gigabit Alliance. http://wirelessgigabitalliance.org/.Google Scholar
- WirelessHD. http://wirelesshd.org/.Google Scholar
- Y. Yu et al. A 60GHz digitally controlled phase shifter in CMOS. In ESSCIRC, 2008.Google ScholarCross Ref
Index Terms
- Augmenting data center networks with multi-gigabit wireless links
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