关键词: 云存储, 多数据副本, 副本放置, 遗传算法（GA）, 生物地理学优化（BBO）

Abstract: The data replica management scheme is a critical component of cloud storage system. In order to improve its scalability and reliability at the same time shorten user access time, the multiple data replica scheme should be adopted and the proper placement for each replica should be determined. Thus, this paper proposes an intelligent multiple data replica placement scheme for cloud storage. This scheme is based on p-center model with minimizing user access cost as its optimization objective. It uses genetic algorithm (GA) to find the optimal data replica placement solution and uses biogeography-based optimization (BBO) algorithm to optimally assign user access request to the specific data replica. The proposed scheme has been implemented based on CloudSim and performance evaluation has been done. The simulation results show that it is both feasible and effective.

Key words: cloud storage, multiple data replica, replica placement, genetic algorithm (GA), biogeography-based optimization (BBO)