Recently, consumer electronics devices have started adopting NAND flash memories as their storage units. NAND flash memories are suitable as portable consumer device storages, as they have several advantages such as non-volatility, high density and low power consumption. However, flash memories are difficult to be used directly as storages in consumer devices because of a limited lifespan, which is one of the major drawbacks of NAND flash memory. Therefore, researchers have investigated ways for improving the lifespan of flash memories. In this article, we propose a hybrid disk buffer management policy, which is called the write pattern aware hybrid disk buffer management policy (WPA). The key advantage of WPA is the reduction of write access to the flash-based storage, and this is possible because WPA analyzes the write access pattern that occurred through our pattern aware migration priority by LRU (PaMP-LRU) algorithm and a page eviction list (PEL). We compared our proposed policy with existing hybrid disk buffer policies to evaluate the performance. Experimental results show that under conditions of write-intensive workloads, the performance of WPA is found to be higher than that of other disk buffer policies. In particular, the improvement of WPA hit ratio is 87.6% on average, and WPA reduces block erase counts in flash storage 38.2% on average, and up to 66.8%, resulting in improving the lifespan of NAND flash memory, compared to other disk buffer management policies.

中文翻译：

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WPA：用于提高 NAND 闪存寿命的写入模式感知混合磁盘缓冲区管理

最近，消费电子设备已开始采用 NAND 闪存作为其存储单元。NAND 闪存适合作为便携式消费设备存储，因为它们具有多个优点，例如非易失性、高密度和低功耗。然而，闪存由于寿命有限而难以直接用作消费设备中的存储器，这是NAND闪存的主要缺点之一。因此，研究人员研究了提高闪存寿命的方法。在本文中，我们提出了一种混合磁盘缓冲区管理策略，称为写模式感知混合磁盘缓冲区管理策略 (WPA)。WPA 的主要优势是减少了对基于闪存的存储的写访问，这是可能的，因为 WPA 通过 LRU (PaMP-LRU) 算法和页面驱逐列表 (PEL) 分析通过我们的模式感知迁移优先级发生的写入访问模式。我们将我们提出的策略与现有的混合磁盘缓冲区策略进行比较以评估性能。实验结果表明，在写入密集型工作负载的条件下，发现 WPA 的性能高于其他磁盘缓冲区策略的性能。特别是WPA命中率平均提高87.6%，WPA减少闪存中的块擦除次数平均38.2%，最高可达66.8%，与其他磁盘缓冲区相比，提高了NAND​​闪存的寿命管理政策。我们将我们提出的策略与现有的混合磁盘缓冲区策略进行比较以评估性能。实验结果表明，在写入密集型工作负载的条件下，发现 WPA 的性能高于其他磁盘缓冲区策略的性能。特别是WPA命中率平均提高87.6%，WPA减少闪存中的块擦除次数平均38.2%，最高可达66.8%，与其他磁盘缓冲区相比，提高了NAND​​闪存的寿命管理政策。我们将我们提出的策略与现有的混合磁盘缓冲区策略进行比较以评估性能。实验结果表明，在写入密集型工作负载的条件下，发现 WPA 的性能高于其他磁盘缓冲区策略的性能。特别是WPA命中率平均提高87.6%，WPA减少闪存中的块擦除次数平均38.2%，最高可达66.8%，与其他磁盘缓冲区相比，提高了NAND​​闪存的寿命管理政策。