MDR Codes: A New Class of RAID-6 Codes with Optimal Rebuilding and Encoding
As storage systems grow in size, device failures happen more frequently than ever before.Given the commodity nature of hard drives employed, a storage system needs to tolerate a certain number of disk failures while maintaining data integrity, and to recover lost data with minimal interference to normal disk I/O operations.RAID-6, which can tolerate up to two disk failures with the minimum redundancy, is becoming widespread.However, traditional RAID-6 codes suffer from high disk I/O overhead during recovery.In this paper, we propose a new family of RAID-6 codes, the Minimum Disk I/O Repairable (MDR) codes, which achieve the optimal disk I/O overhead for single failure recoveries.Moreover, we show that MDR codes can be encoded with the minimum number of bit-wise XOR operations.Simulation results show that MDR codes help to save about half of disk read operations than traditional RAID-6 codes, and thus can reduce the recovery time by up to 40%.
RAID-6 codes disk I/O encoding complexity distributed storage systems erasure codes
Yan Wang Xunrui Yin Xin Wang
School of Computer Science, Fudan University;School of Software, East China Jiao Tong University Department of Computer Science, University of Calgary School of Computer Science, Fudan University
国际会议
昆明
英文
90-106
2014-05-01（万方平台首次上网日期，不代表论文的发表时间）