Abstract: It is a hot topic in the area of cloud computing how to guarantee data reliability in cloud storage systems. The copy backup technology is an important approach to guaranteeing data reliability. However, there are some disadvantages such as taking up too much disk space and having low saving efficiency. Erasure code can provide optimized data redundancy thereby preventing data loss. Applying erasure code properly can help improve space utilization ratios and acquire satisfactory data protection effects. It has been widely used in communications. This paper introduces erasure code to cloud storage systems to replace the copy backup strategy and improve the performance of cloud storage systems. Experiments show that the scheme can effectively improve data reliability and space utilization.

Key words: cloud storage, erasure codes, tolerant, redundant backup

摘要： 如何保障云存储系统中数据的可靠性是云计算领域的热点问题。副本备份技术是保障数据可靠性的重要手段，但是存在占用存储空间大、存储效率低等问题。纠删码能够提供优化的数据冗余度，以防止数据丢失，恰当地使用纠删码可以提高空间的利用效率并获得较好的数据保护效果，在通讯方面已经得到广泛应用。将纠删码引入云存储系统中，代替副本备份策略，以提高云存储系统的性能。实验表明该方案可以有效提高数据可靠性和空间利用率。

关键词: 云存储, 纠删码, 容错, 冗余备份