体全息数据存储文件系统空间分配策略研究

通过分析体全息数据存储的物理寻址方式，提出了对逻辑块地址实行二维编址的策略。以二维逻辑块地址为基础，对体全息数据存储文件系统空间分配的连续性进行了研究，提出了“顺序连续”和“随机连续”的概念。对二维区域采用了四叉树结构进行组织，并以四叉树为基础设计了成组分配空闲块算法。在体全息数据存储文件系统原型系统的基础上，对模拟的全息存储体进行“文件级”的测试，结果证明二维分配策略能有效地提高文件数据块分配的连续性。

Research on space allocation strategy of the volume holographic data storage

Through analyzing physical addressing mode of volume holographic data storage(VHDS),two-dimensional addressing strategy of logical block address was given,by which the data-block of the file was allocated.By researching the continuity of file data-block allocation on two-dimensional logical block address,the concepts of "sequence continuity" and "stochastic continuity" were presented. Based on allocation quadruple-tree which was adopted as framework of the twodimensional logic area,the allocation algorithm for multiple block was designed.On the prototype system of VHDS,testing of the allocation strategies of data-block in the "file" level was made.The testing results prove that two-dimensional allocation strategy can make file data-blocks to be allocated more consecutive.