hierarchical storage system meaning in Chinese

分级存储系统

Query processing is the key in developing massive information system based on hierarchical storage system
查询处理技术的研究是基于三级存储系统的海量数据管理系统研究中的一个重点和难点。
We propose two replacement algorithm of disk cache in the hierarchical storage systems to put the really popular programs into the disk cache
本文提出了两种层次化存储系统中的磁盘cache替换算法。