关键词: RDP码, 单盘故障, 读取开销

Abstract: Now with the expansion of storage systems and the widespread use of inexpensive disks, the probability of a single disk failure occurred in a storage system is on the rise. In an RDP-based array storage system, recovering a single failed disk requires reading all the remaining data disks with a large read cost and long fault recovery time. The recovery of a long time will lead to the system in the recovery process increases the probability of error, affecting the overall stability of the system. In order to further reduce the reading overhead of a single disk failure recovery, reduce the recovery time and improve the reliability of the storage system, a kind of local repairable RDP code is proposed, which is adding a local redundant column to reduce the amount of data needed in recovery. The experimental results show that the improved method has a significant improvement over the traditional RDP single disk recovery method in reducing the reading overhead and reducing the recovery time, and in some cases, it can tolerate 75% of the three errors.

Key words: RDP code, single disk failure, reading overhead