Chieh-Jan Mike Liang, Jie Liu, Liqian Luo, Andreas Terzis, and Feng Zhao
RACNet is a sensor network for monitoring a data center’s
environmental conditions. The high spatial and temporal
fidelity measurements that RACNet provides can be used
to improve the data center’s safety and energy efficiency.
RACNet overcomes the network’s large scale and density
and the data center’s harsh RF environment to achieve data
yields of 99% or higher over a wide range of network sizes
and sampling frequencies. It does so through a novel Wireless
Reliable Acquisition Protocol (WRAP). WRAP decouples
topology control from data collection and implements a
token passing mechanism to provide network-wide arbitration.
This congestion avoidance philosophy is conceptually
different from existing congestion control algorithms that
retroactively respond to congestion. Furthermore, WRAP
adaptively distributes nodes among multiple frequency channels
to balance load and lower data latency. Results from two
testbeds and an ongoing production data center deployment
indicate that RACNet outperforms previous data collection
systems, especially as network load increases.
In Proceedings of The 7th ACM Conference on Embedded Networked Sensor Systems (SenSys 2009)
Publisher Association for Computing Machinery, Inc.
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