Paper Info
Title
Reliability-aware energy management for hybrid storage systems
Abstract
Modern disk-based storage systems are not energy proportional, because disks consume almost as much power when idle (but spinning) as they do when actively accessing data. We combine a power-aware, solid-state (flash) cache and a reliability-aware disk spindown mechanism to significantly improve storage energy proportionality without hurting disk reliability, data integrity, or performance. We evaluated the resulting power- and reliability-aware hybrid flash-disk RAID storage array and found that it reduces energy consumption by 85% compared to a similar-cost, similar-performance typical configuration of all SAS drives that are never spun down. Our design also achieves almost 50% energy savings compared to hybrid flash-disk systems tuned for performance or that do not take full advantage of opportunities for safe spindown. Further, unlike most previous work that exploits spindown to save energy, we limit the rate at which disks are spun down to avoid premature mechanical failures, whereas reliability-unaware spindown algorithms can exceed manufacturer waranteed lifetime spindown limits in as little as one year.
Year
DOI
Venue
2011
10.1109/MSST.2011.5937221
MSST
Keywords
Field
DocType
RAID,cache storage,flash memories,disk-based storage systems,hybrid storage systems,power-aware solid-state cache,reliability-aware disk spindown mechanism,reliability-aware energy management,reliability-aware hybrid flash-disk RAID storage,reliability-unaware spindown algorithms
Energy management,Spinning,Idle,Computer science,Cache,Data integrity,RAID,Hybrid storage,Energy consumption,Embedded system
Conference
ISSN
Citations 
PageRank 
2160-195X
7
0.44
References 
Authors
20
3
Name
Order
Citations
PageRank
Wes Felter159852.82
Anthony Hylick2403.11
John B. Carter31785162.82