Storage Informer
Storage Informer

Dynamic Power Allocation for Server Groups

by on Jun.07, 2009, under Storage

Dynamic Power Allocation for Server Groups

The Intel(r) Dynamic Power Node Manager technology allows setting a power consumption target for a server under load as described in a previous article.  This is useful for optimizing the number of servers in a rack when the rack is subject to a power budget.

Higher level software can use this capability to implement sophisticated power management schemes, especially schemes that involve server groups.The reader might ask about the possibility of constantly running servers in capped mode to save energy.This document provides an example of the performance tradeoff with power capping.The following example illustrates how group power capping works.The light blue band represents the focus of the plot. The focus can be changed with a simple mouse click.There are four lines represented in the graph.plate power.The next line down is the derated power.Finally, the gold line represents the actual power consumed by the server.The servers are running at full power using the SPECpower benchmark.When we instructed Data Center Manager to hold a power cap for the group rack (2), it makes an effort to maintain power at that level, in spite of unavoidable disturbances in the system.The source of the disturbances can be internal or external.epieg3urb07 down to idle.Note that it takes a few seconds for Data Center Manager to react and to reach the original power level.The figure above captures the behaviors of the individual servers.


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