Storage Informer
Storage Informer

Energy Management vs. Power Management in Data Center Servers

by on Jul.13, 2009, under Storage

Energy Management vs. Power Management in Data Center Servers

There are two technologies available to regulate power consumption in the recently introduced Nehalem servers using the Intel® Xeon® processor 5500 series.  The first is power proportional computing where power consumption varies in proportion to the processor utilization.  The second is Intel® Dynamic Node Manager (DPNM) technology which allows the setting of a target power consumption when a CPU is under load.  The power capping range increases with processor workload.

An immediate benefit of the Intel Does this mean that it will be possible to cut the electridity bills by one third to one half using DPNM?Enforcing this power cap brings operational flexibility: it is possible to deploy more servers to fit a limited power budget to prevent breakers from tripping or to use less electricity during peak demand periods.There is a semantic distinction between energy management and power management.The energy saved through the application of DPNM is represented by the area between the dotted line and the white graph line below; the power consumed by the server is represent by the area under the solid white graph line. One mechanism for achieving significant energy savings calls for dividing a group of servers running an application into pools or "platoons".As the workload diminishes, additional servers are moved into a sleeping state. Implementing this scheme can be logistically complex. We are conducting experiments to asses the potential for energy savings.


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