LazyRS: Improving the Performance and Reliability of High-Capacity TLC/QLC Flash-Based Storage Systems Using Lazy Reprogramming

We propose a new NAND programming scheme called the lazy reprogramming (LazyRS) which divides program operation into two stages, where second stage is delayed until it needed. LazyRS optimizes latency by skipping if not required. An idle interval before improves flash reliability as well. To maximize benefit of LazyRS, LazyRS-aware FTL adjusts length an dynamically over changing workload characteristics. The experimental results show that can efficiently improve write throughput and flash-based storage systems up to 2.6 times 31.2%, respectively.