Abstract
Existing triple-failure-tolerant codes assume that failures are independent and instantaneous. Such assumptions overlook the underlying mechanism of multi-failure occurrences and ignored the effect of reconstruction window. These codes are not adapted to the occurrence pattern of failure in real-world applications. As a result, the third parity drive is almost idle as it set to handle the triple-failure scenario only with lower-level failure situations unattended. Furthermore, the problem of single failure rebuild deteriorates with the increasing disk capacity, and the system’s reliability will decrease with user experience impaired. Aiming at these problems, a fast reconstructable coding scheme extended from RAID-6 has been developed in this study. RAID-6Plus maintains a smaller reconstruction window by recoding the third parity drive. Existing codes provide absolute reliability for triple failures via full combinations. As a contrast, RAID-6Plus employs short combinations which are able to greatly reuse overlapped elements during reconstruction to remake the third parity drive. The short combinations shorten the reconstruction window of single failure, which avoids multi-failure overlapping in the reconstruction window. The capability of multi-failure degradation provides RAID-6Plus with (1) a better system performance comparing to RTP and STAR and (2) an enhanced reliability comparing to RAID-6.
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Acknowledgment
We are grateful to our anonymous reviewers for their suggestions to improve this paper. This work is supported by the National Natural Science Foundation of China under Grant Nos. 61232003, 61332003, 61202121, 61402503, 61303073.
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Deng, MZ. et al. (2015). RAID-6Plus: A Fast and Reliable Coding Scheme Aided by Multi-failure Degradation. In: Yao, L., Xie, X., Zhang, Q., Yang, L., Zomaya, A., Jin, H. (eds) Advances in Services Computing. APSCC 2015. Lecture Notes in Computer Science(), vol 9464. Springer, Cham. https://doi.org/10.1007/978-3-319-26979-5_15
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DOI: https://doi.org/10.1007/978-3-319-26979-5_15
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