关键词: RS纠删码, 伽罗瓦域, 信息分散算法, 分布式存储

Abstract: Information Dispersal Algorithm (IDA) based on Reed-Solomon (RS) code can be used in high strong and reliable distributed storage system. The encoding/decoding speed is an important criterion for the availability of the RS code. Firstly the erasure principium of RS codes was analyzed, the Galois field that the encode/decode operations located was discussed. Based on the characteristics of the arithmetic operations in Galois field, a double-table method was designed to gain encoding/decoding speed. At last, the efficiency of the algorithm was analyzed in both theory and experiment. The experimental results show that the IDA can provide an encoding/decoding speed at 18Mbps. Based on the results of the experiment, this paper analyzed the fit circumstance for the algorithm, and pointed out the future research aspect about IDA.

Key words: Reed-Solomon (RS) code, Galois field, Information Dispersal Algorithm (IDA), distributed storage