Storage Informer
Storage Informer

Energy Management vs. Power Management in the Data Center, Take 2

by on Aug.19, 2009, under Storage

Energy Management vs. Power Management in the Data Center, Take 2

I would like to elaborate on the topic energy vs. power management in my previous entry.

Upgrading the electrical power infrastructure to accommodate additional servers is not an option in most data centers today.There are two types of potentially useful figures of merit, one for power management and one for energy management.To understand the dynamic between power and energy management let&aposs look at the graph below and imagine a server without any power management mechanisms whatsoever.t is P(actual)(t).t(1) through t(2) yields the energy saved.Please note that a mechanism that yields significant power savings may not necessarily yield high energy savings.Another useful figure of merit for power management is the dynamic range for power proportional computing.The relationship is not always linear, but the figure illustrates the concept.If a 50 percent P(baseline) looks outstanding, we can do even better for certain application environments such as load-balanced front end Web server pools and the implementation of cloud services through clustered, virtualized servers.platooning.In the figure below note that each platoon is defined by the application of a specific technology or state within eachThe CPU is not running in any of the S-states than S0.A virtualized environment makes it easier to rebalance workloads across active (unconstrained and power capped) servers.The extra dynamic power range comes at the expense of instituting additional processes and operational complexity.HS22 blade servers versus the HS20 model only three years old.Network World reports a similar figure, a ten-fold increase in performance, not just ten percent.I will be elaborating on some of these ideas at the PDCS Cloud Power Management with the Intel(r) Nehalem Platform class at the upcoming Intel Developer Forum in San Francisco on the week of September 20th.


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