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首页> 外文期刊>IEICE Electronics Express >A Flash-aware Intra-disk Redundancy scheme for high reliable All Flash Array
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A Flash-aware Intra-disk Redundancy scheme for high reliable All Flash Array

机译：一种闪存感知的磁盘内冗余方案，可实现高可靠性的全闪存阵列

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References(17) In SSD-based All Flash Array (AFA), Redundant Array of Independent Disks (RAID) technologies are widely used to cope with drive failures and sector errors. However, the redundancy in disk level is either insufficient like RAID-5 or excessive like RAID-6. In order to combat the two types of errors, we combine the RAID-5 scheme with a Flash-aware Intra-disk Redundancy (FAIDR) scheme. For saving parity space, the ratio of redundancy in the FAIDR scheme grows with the increasing of sector errors. However, the parity handling overhead is significant. As NAND Flash blocks can’t be updated before erase, we establish all FAIDR stripes on the physical page number of blocks regardless of the page state. Thus, the parity update operations in FAIDR are eliminated. Simulation results show that the proposed scheme has the ability to ensure the AFA’s reliability in its all lifetime. It gains 41 percent storage capacity in comparison to RAID-6. And it only leads to very small performance loss compared with pure RAID-5.
机译：参考文献（17）在基于SSD的全闪存阵列（AFA）中，独立磁盘冗余阵列（RAID）技术被广泛用于应对驱动器故障和扇区错误。但是，磁盘级别的冗余要么像RAID-5那样不足，要么像RAID-6那样过多。为了解决两种类型的错误，我们将RAID-5方案与具有闪存功能的磁盘内冗余（FAIDR）方案结合在一起。为了节省奇偶空间，FAIDR方案中的冗余率随扇区错误的增加而增加。但是，奇偶校验处理开销很大。由于无法在擦除前更新NAND闪存块，因此无论页面状态如何，我们都会在块的物理页数上建立所有FAIDR条带。因此，消除了FAIDR中的奇偶校验更新操作。仿真结果表明，所提出的方案能够确保AFA在其整个生命周期内的可靠性。与RAID-6相比，它的存储容量提高了41％。与纯RAID-5相比，它只会导致很小的性能损失。

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