NDLI: Energy efficient and reliable storage disks

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Energy efficient and reliable storage disks

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Energy efficient and reliable storage disks

Content Provider	ACM Digital Library
Author	Bellam, Kiranmai Manzanares, Adam Qin, Xiao
Abstract	Computer hard disks have different failure probability rates that are a function of age and utilization. In this paper the relationship between the disk age, utilization, and failure probabilities are determined. This relationship is used to estimate a safe utilization zone for a disk dependent on its age. Results prove that when disks are operated in safe utilization zones the probability of failure is minimised drastically. Energy consumption is reduced by operating the disks at three power modes: Active, Idle and Sleep. We considered a storage system organized using RAID 1 for the experiments. In RAID 1 data is mirrored to the backup disks from the primary disks. Traditional methods wake up the backup disks when the utilization of the primary disks exceeds 100 percent or both the disks are always active to balance the load between the disks. These methods consume a massive amount of energy. Hence, we designed a policy where we determine the safe utilization levels for the disks to operate with minimum probability failure rates while also conserving energy. This approach is not only reliable but also saves a significant amount of energy.
Starting Page	7
Ending Page	12
Page Count	6
File Format	PDF
ISBN	9781605581057
DOI	10.1145/1593105.1593108
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-03-28
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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