Zephyr: A Model-based Approach to Unified Thermal and Power Management

Thursday, May 21, 2009 - 1:45pm


Monday, June 1, 2009
3:30 – 4:30
Computer Science Conference Room, Harold Frank Hall Rm. 1132

HOST: Divy Agrawal

SPEAKER: Niraj Tolia
HP Labs

Title: Zephyr: A Model-based Approach to Unified Thermal and Power


Improving the cooling efficiency of servers has become an essential
requirement in data centers today as the power used to cool the servers
has become an increasingly large component of the total power usage.
Unfortunately, most previous approaches have individually focused on
reducing either the server power or the power used by the fans to cool
the servers. This work presents Zephyr, a systems approach to managing
fan power that combines conventional server power optimizations with fan
power management to optimize overall energy efficiency. By combining
distributed system design with concepts from heat transfer theory,
Zephyr can reduce cooling power by up to 21% when compared to a
feedback-based controller and up to 30% when combined with cooling-aware
workload migration policies. Overall, the combined Zephyr system can
reduce total system power by up to 29% without impacting application


Niraj Tolia is a researcher in the Exascale Data Center project at HP
Labs and is working on power, performance, and management-related issues
for next-generation data centers and the cloud. His research interests
span the fields of distributed systems, virtualization, storage systems,
and operating systems. He received his Ph.D. from Carnegie Mellon
University in 2007 and has been at HP since.