MD RAID fast reconstruction system and method

The invention relates to an MDRAID rapid reconstruction system and method, and belongs to the technical field of data storage. According to the scheme, valid data of the storage space is sensed through the stripe bitmap and the file system analyzer, invalid reconstruction is reduced, the RAID reconstruction efficiency is improved, and the reconstruction time is greatly shortened for the sparse storage space; meanwhile, a dynamic local recombination scheme is introduced, lost effective data are reconstructed to a new RAID space, the concurrency advantage of multiple disks in the array is exerted, and self-healing of the RAID system under the condition that no hot spare disk exists is achieved. 本发明涉及一种MDRAID快速重构系统及方法，属于数据存储技术领域。该方案通过条带位图和文件系统分析器感知存储空间有效数据，减少无效的重构，提高了RAID的重构效率，对稀疏的存储空间，极大地缩短了重构时间；同时引入了动态局部重组的方案，将丢失的有效数据重构到新的RAID空间，既发挥了阵列中多盘的并发优势，又实现了无热备盘条件下RAID系统的自愈。