计算机科学 ›› 2023, Vol. 50 ›› Issue (7): 38-45.doi: 10.11896/jsjkx.220900179
张耀方1,2,3,4, 李培轩1,2,3,4, 谢平1,2,3,4,5
ZHANG Yaofang1,2,3,4, LI Peixuan1,2,3,4, XIE Ping1,2,3,4,5
摘要： 针对闪存存储器的密度增大和容量增加导致可靠性下降的问题,提出了一种基于LDPC读延迟的刷新和副本结合策略优化方案。通常,原始策略是在闪存存储器上加一个LDPC码模块,使用硬解码和软解码对数据进行纠错。而传统的刷新策略是在原始策略的基础上,在LDPC软解码未能纠错时,使用刷新策略对其进行纠错。本方案基于LDPC软解码7个量化级别的特性,并以此为判定条件,采用分析对比的方法确定刷新的条件是量化级别到达3,副本的条件是级别达到5,将两种方式合理地应用在LDPC软解码方式中。与前两种策略相比,所提方法缩短了闪存存储器的平均响应时间,在一定程度上提升了闪存存储器的读取性能。在模拟器disksim+ssd的扩展平台上进行仿真,实验结果表明,相比原始策略,该方案平均响应时间均值降低了10%;与传统的刷新策略相比,延长了闪存存储器的寿命。
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