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Analysis of disk power management for data-center storage systems

Content Provider	ACM Digital Library
Author	Bostoen, Tom Mullender, Sape Berbers, Yolande
Abstract	Up to one third of the electricity supplied to a data center is required for the operation of the storage subsystem. A typical data-center workload, characterized by short idle periods, prevents traditional disk power management (DPM) from saving energy. This paper starts with an analysis of DPM's traditional timer-based disk spin-down policy. Next, we examine how a multispeed disk adapts DPM to data-center workloads. Finally, we determine how to shape the workload to enable DPM on conventional server disks. All analysis is based on an analytical model for the energy consumed by a disk during an idle period. In addition, we assume standby power to be non-negligible. The results are that (1) the competitive ratio of a threshold-based disk spin-down policy depends on the ratio of standby power to idle power, (2) the notion of break-even time can be generalized for multispeed disks, and (3) DPM saves most energy when mean idle time and idle-time variance are maximized. With this analysis, the authors intend to stimulate the design of new data-center file and storage systems that optimally exploit DPM to save energy.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISBN	9781450310550
DOI	10.1145/2208828.2208830
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-05-09
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Disk drive Cloud storage Power reduction Data center Energy efficiency
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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