中文摘要：

文中分析了磁盘、SSD和DRAM的价格和能耗,测试了分布式文件系统HDFS、MooseFS和CarrierFS部署在不同存储介质上的数据吞吐率,接着提出了一种存储介质的性价比理论模型,并分析了当前、2015年和2020年不同存储介质的性价比和变化趋势.通过性价比分析可得,DRAM具有较大的性价比优势,适合于高并发随机访问应用.随着DRAM容量的快速提升,未来DRAM有可能成为可选的数据存储介质.当前,SSD虽然具有较好的访问性能,但其价格高、容量小、性价比低于磁盘.2015年SSD的性价比将超过磁盘,有可能替代磁盘成为大规模存储系统的基本存储设备.

英文摘要：

This paper investigates the price and power consumption of the disks, SSD, and DRAM, and also tested the read and write throughputs of HDFS, MooseFS, and CarrierFS based on these storage mediums. Then, it proposes an estimation model of performance-price ratio for these storage mediums and also predicted and the change trends of their performance-price ratio in 2015 and 2020. From the analysis results, we can see that DRAM has the advantage of high performance-price ratio and are suitable for highly parallel random access applications. As its ca- pacity grows, it will become an optional device for storage systems in the near future. Although SSD can provide better access performance than hard disks, it has lower performance-price ratio due to its higher price and smaller capacity. However, the authors predict that in 2015, its per- formance-price ratio will become higher than hard disks and thus may substitute for hard disks to become the major device for large-scale storage systems.