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PDB: A Reliability-Driven Data Reconstruction Strategy Based on Popular Data Backup for RAID4 SSD Arrays

机译:PDB:一种基于可靠性的数据重建策略,基于RAID4 SSD阵列的流行数据备份

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With the application of MLC (multi-level cell) and TLC (triple-level cell) techniques, the price of NAND flash memory based SSD (solid-state drive) decreases rapidly with increasing capacity. However, these techniques negatively influence the reliability of SSD as they lead to a larger number of raw flash memory errors. When multiple such reliability degraded SSDs organized in a RAID structure SSD failures could occur. Thus, a reliability-aware data reconstruction mechanism that can quickly recover the data of a failed SSD onto a replacement SSD becomes essential. In this paper, we propose a reliability-driven data reconstruction strategy called PDB (Popular Data Backup) for RAID4 and SPD-RAID4 (Splitting Parity Disk - RAID4), a variant of RAID4. PDB collaboratively backups popular data among data SSDs to achieve a shorter "window of vulnerability". Experimental results demonstrate that compared with the traditional SOR (Stripe Oriented Reconstruction) method PDB can shorten reconstruction time up to 31.3%.
机译:随着MLC(多层单元)和TLC(三层单元)技术的应用,基于NAND闪存的SSD(固态驱动器)的价格随着容量的增加而迅速下降。但是,由于这些技术会导致大量原始闪存错误,因此会对SSD的可靠性产生负面影响。当以RAID结构组织的多个此类可靠性下降的SSD发生故障时,SSD可能发生故障。因此,一种能够迅速将发生故障的SSD的数据恢复到替换SSD上的可靠性感知数据重建机制就变得至关重要。在本文中,我们为RAID4和SPD-RAID4(拆分奇偶校验磁盘-RAID4)(一种RAID4的变体)提出了一种由可靠性驱动的数据重建策略,称为PDB(流行数据备份)。 PDB协同备份数据SSD中的流行数据,以实现更短的“漏洞窗口”。实验结果表明,与传统的SOR(条带化定向重建)方法相比,PDB可以将重建时间缩短多达31.3%。

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