【作者】 吉永光；

【导师】 周可；

【作者基本信息】 华中科技大学 ， 计算机系统结构， 2007， 硕士

【摘要】 磁盘阵列在海量存储系统中有着广泛的应用,然而其系统总线带宽限制了底层通道的并行性,存储系统内部接口性能的差异制约着存储系统性能的提升。因此,消除系统总线带宽瓶颈和接口性能差异对提升存储系统整体性能具有重要的研究意义。树型结构存储系统采用树型结构对数据进行组织和管理,改变了磁盘阵列传统的数据组织管理模式。树型结构多通道、高并行的特点能有效解决存储系统内部的总线带宽瓶颈,降低总线争用概率,提高总线利用率;树型结构的高扩展性增强了存储系统的可扩展性和兼容性;树型结构存储系统利用高速存储设备对低速通道连接的存储设备上的数据进行缓存,实现层间缓存技术,减小低速通道对系统性能的制约,有效提高了系统的整体性能。单元控制器是构成树型结构存储系统的主要部件,通过上行高速通道和下行低速通道连接到主机或其它单元控制器,磁盘构成系统的叶子节点。树结构存储系统提出了三种数据分块方式:无校验块交叉方式(DT0),分级镜像方式(DT1),分级奇偶校验方式(DT2)。树型结构存储系统有效解决了总线带宽瓶颈、通道带宽匹配、集合总线带宽等问题,并使用不同接口标准的存储设备进行并行数据传输。与磁盘阵列相比,树型结构存储系统提高了存储系统的并行性与扩展性。更多还原

【Abstract】 Redundant arrays of inexpensive disks are widely used in storage servers. But the finite bandwidth of the system bus limits the parallel of the bottom storage channels; Performance of each access technologies used in the storage system also limits the performance of system. So it is necessary to solve the bottleneck of the system bus and lessen the performance distinction of the access technologies.Tree structure storage system uses the tree structure for the data organization and management, and changed the tranditional model of data management. Tree structure can solve the bottleneck of the system bus and reduce the competition probability effectively, because of its multi-channel character and its parallel; The high scalability of the tree structure make the storage system update easily, and also enhance the scalability of the storage system; cache technology of the channel that is used in the tree structure storage system can lessen the performance distinction of the access technologies.Tree structure storage system is consisted of control cell, that use upward channel and downtrend channel to connect to the host or other control cell. The leafage of this storage system is made of disks. There are three main method for the data distribution of the tree structure storage system: striping method(DT0), Mirroring distribution method(DT1), Parity distribution method(DT2).Tree structure have solved the problems of bandwidth matching, polymerization bandwidth and so on. It makes the devices that have different access technology work together and transfer the data parallel. Compared with RAID, tree structure storage system increases the parallel and expansibility of the storage system.更多还原