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Full-Text Articles in Physical Sciences and Mathematics
P-Code: A New Raid-6 Code With Optimal Properties, Chao Jin, Hong Jiang, Dan Feng, Lei Tian
P-Code: A New Raid-6 Code With Optimal Properties, Chao Jin, Hong Jiang, Dan Feng, Lei Tian
CSE Conference and Workshop Papers
RAID-6 significantly outperforms the other RAID levels in disk-failure tolerance due to its ability to tolerate arbitrary two concurrent disk failures in a disk array. The underlying parity array codes have a significant impact on RAID-6’s performance. In this paper, we propose a new XOR-based RAID-6 code, called the Partition Code (P-Code). P-Code is a very simple and flexible vertical code, making it easy to understand and implement. It works on a group of (prime – 1) or (prime) disks, and its coding scheme is based on an equal partition of a specified two-integer-tuple set. P-Code has the following properties: …
Jor: A Journal-Guided Reconstruction Optimization For Raid-Structured Storage Systems, Suzhen Wu, Dan Feng, Hong Jiang, Bo Mao, Lingfang Zeng, Jianxi Chen
Jor: A Journal-Guided Reconstruction Optimization For Raid-Structured Storage Systems, Suzhen Wu, Dan Feng, Hong Jiang, Bo Mao, Lingfang Zeng, Jianxi Chen
CSE Conference and Workshop Papers
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 …