动态虚拟盘阵数据分布算法

尽管当今的磁盘等外存储设备容量增加得很快，但还是无法满足用户应用程序的需要；在性能上，外存储设备已经成为计算机系统的瓶颈；为此，在集群环境下，将分布式的外设构成动态虚拟盘阵系统是一种较好的解决方案，而数据分布算法是动态虚拟研究的一项重要内容。也就是说，采用优化的数据分布算法，使得盘阵的性能和容量随盘阵的扩展而扩展。研究的主要工作是综述以往对动态盘阵数据分布算法，并对以往SCADDAR算法进行了扩充，提出了D／H(Double／Halve)数据分布算法。

Data placement algorithms in dynamic virtual disk array

Although disk capacity is increased quickly, it can't satisfy the need of applications, and storage system becomes the main bottleneck of computer system in performance. To solve the problem, it is a good idea to construct the distributed disks in cluster system into a DVDA (dynamic virtual parallel disk array). Through good data organization, DVDA can scale its capacity and performance according to the user or application need. So the data placement algorithm is one most important researches in DVDA. DVDA data placement algorithms in existence is summarized. SCADDAR algorithm is improved and it is provided with a new placement, D/H method. It is a most usefully one.