DocumentCode :
3246011
Title :
JOR: A Journal-guided Reconstruction Optimization for RAID-Structured Storage Systems
Author :
Wu, Suzhen ; Feng, Dan ; Jiang, Hong ; Mao, Bo ; Zeng, Lingfang ; Chen, Jianxi
Author_Institution :
Sch. of Comput. Sci. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China
fYear :
2009
fDate :
8-11 Dec. 2009
Firstpage :
609
Lastpage :
616
Abstract :
This paper proposes a simple and practical RAID reconstruction optimization scheme, called JOurnal-guided Reconstruction (JOR). JOR exploits the fact that significant portions of data blocks in typical disk arrays are unused. JOR monitors the storage space utilization status at the block level to guide the reconstruction process so that only failed data on the used stripes is recovered to the spare disk. In JOR, data consistency is ensured by the requirement that all blocks in a disk array be initialized to zero (written with value zero) during synchronization while all blocks in the spare disk also be initialized to zero in the background. JOR can be easily incorporated into any existing reconstruction approach to optimize it, because the former is independent of and orthogonal to the latter. Experimental results obtained from our JOR prototype implementation demonstrate that JOR reduces reconstruction times of two state-of-the-art reconstruction schemes by an amount that is approximately proportional to the percentage of unused storage space while ensuring data consistency.
Keywords :
RAID; data structures; RAID reconstruction optimization scheme; data consistency; data storage systems; disk array; journal-guided reconstruction scheme; storage space utilization; Availability; Computer displays; Computer science; Degradation; Laboratories; Paper technology; Prototypes; Reconstruction algorithms; Switches; System performance; RAID; performance evaluation; reconstruction; reliability; storage system;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Parallel and Distributed Systems (ICPADS), 2009 15th International Conference on
Conference_Location :
Shenzhen
ISSN :
1521-9097
Print_ISBN :
978-1-4244-5788-5
Type :
conf
DOI :
10.1109/ICPADS.2009.69
Filename :
5395357
Link To Document :
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