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Age Distribution Convergence Mechanisms for Flash Based File Systems

机译:基于闪存的文件系统的年龄分布融合机制

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—Solid state devices are common choices for data and systems storage in many high assurance application domains due to features such as no moving parts, shock/temperature resistance and low power consumption. On the other hand, they present new challenges in data reliability concerns. In multilevel cell NAND flash memories the bit error rate increases exponentially with reduced endurance limit as compared to single-level cell NAND flash memories. This can significantly reduce the data reliability and integrity of flash based storage systems. One solution to this is Redundant Array of Independent Disk (RAID) mechanisms. However these have an inherent problem as all flash memory chips wear out at the same time due to equal distribution of write operations. Recent solutions such as Diff-RAID partly solve this problem using uneven parity distribution mechanism, but suffer age-variation problems thereby decreasing the reliability of the array as well as increasing the cost.
机译:-Solid状态器件是由于不具有运动部件,冲击/耐温性和低功耗的特征,在许多高保证应用领域中的数据和系统存储的常见选择。另一方面,它们在数据可靠性问题上提出了新的挑战。在多级单元NAND闪存中,与单级单元NAND闪存存储器相比,误码率随着耐久性极限而导致的符号误差。这可以显着降低基于闪存的存储系统的数据可靠性和完整性。其中一个解决方案是独立磁盘(RAID)机制的冗余阵列。然而,这些具有固有的问题,因为所有闪存芯片由于写入操作的平等分布而在同一时间磨损。诸如Diff-RAID的最近解决方案部分地使用不均匀奇偶校验机制解决了该问题,但遭受了年龄变化问题,从而降低了阵列的可靠性以及增加成本。

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