Rabb et: Using Layout-Aware Backup for RAID Reconstruction |
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Authors: | ZHU Xudong XU Wei MAO Yuxin ZHU Ping |
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Affiliation: | 1. Zhejiang Gongshang University, Hangzhou 310018, China;Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100080, China;2. Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100080, China;3. Zhejiang Gongshang University, Hangzhou 310018, China |
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Abstract: | Once a disk of storage system is failed, RAID mechanism will reconstruct to keep the reliability. The reconstruction leads to a sharp deterioration in I/O performance of RAID, and the storage system cannot pro-vide high performance service for the applications. The Multi-TB disk capacity and high load of the application make the reconstruction last for a very long time. This paper proposes Rabbet, a method accelerating RAID re-construction using data of backup. Rabbet includes a new RAID reconstruction frame, a RAID layout-aware map-ping mechanism for backup, and a reconstruction algo-rithm. The result of experiments shows that, comparing to the classic DOR methods Rabbet shortens the RAID5 reconstruction process to 13.9%–42.8% and decreases the average response time for applications during reconstruc-tion by 3.2%–14.6%. Rabbet also improves the reliability of storage systems. |
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Keywords: | RAID reconstruction Backup Layout-aware |
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