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在NAND闪存存储系统的垃圾回收过程中,重新定义物理块的年龄和数据热度的计算方法,混合使用热块挑选策略和冷块挑选策略回收热数据块和冷数据块,并将回收块中的有效数据按照逻辑页的热度分为“热”数据和“冷”数据,分别写入到擦除次数最小的块和擦除次数最大的物理块中,减少在回收块的过程中多次对“冷”数据重复无意义拷贝.仿真实验结果表明,与当前主要几种磨损均衡算法相比,在保证回收效率的前提下,取得了很好的磨损均衡效果,同时,擦除次数和拷贝次数大幅度减少.
During the garbage collection process of the NAND flash memory storage system, the calculation method of redefining the age of the physical block and the heat of the data is mixed, the hot block selection strategy and the cold block selection strategy are mixed to recover the hot data block and the cold data block, and the The valid data is divided into “hot” data and “cold” data according to the heat of the logical page, and is respectively written into the block with the least erasing and the block with the highest erasing times, so as to reduce the time when the block is reclaimed Repeated “cold” data repeated meaningless copies. Simulation results show that compared with the current several main wear leveling algorithm, under the premise of ensuring the recovery efficiency, and achieved a good wear leveling effect, while wiping In addition to the number of times and the number of copies significantly reduced.