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首页> 外文期刊>IEEE Transactions on Parallel and Distributed Systems >Durable Address Translation in PCM-Based Flash Storage Systems
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Durable Address Translation in PCM-Based Flash Storage Systems

机译：基于PCM的闪存系统中的持久地址转换

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摘要

Phase change memory (PCM) is a promising DRAM alternative because of its non-volatility, high density, low standby power and close-to-DRAM performance. These features make PCM an attractive solution to optimize the management of NAND flash memory in embedded systems. However, PCM's limited write endurance hinders its application in embedded systems. Therefore, how to manage flash memory with PCM-particularly guarantee PCM a reasonable lifetime-becomes a challenging issue. In this paper, we propose to partially replace DRAM using PCM to optimize the management of flash memory metadata for better system reliability in the presence of power failure and system crash. To prolong PCM's lifetime, we present a write-activity-aware PCM-assisted flash memory management scheme, called PCM-FTL. By differentiating sequential and random I/O behaviors, a novel two-level mapping mechanism and a customized wear-leveling scheme are developed to reduce writes to PCM and extend its lifetime. We evaluate PCM-FTL with a variety of general-purpose and mobile I/O workloads. Experimental results show that PCM-FTL can significantly reduce write activities and achieve an even distribution of writes in PCM with very low overhead.
机译：相变存储器（PCM）具有非易失性，高密度，低待机功耗和接近DRAM的性能，因此是有前途的DRAM替代产品。这些功能使PCM成为优化嵌入式系统中NAND闪存管理的有吸引力的解决方案。但是，PCM的有限写入耐力阻碍了其在嵌入式系统中的应用。因此，如何用PCM管理闪存尤其是确保PCM的合理使用寿命成为一个具有挑战性的问题。在本文中，我们建议使用PCM部分替换DRAM，以优化闪存元数据的管理，从而在出现电源故障和系统崩溃的情况下提高系统可靠性。为了延长PCM的寿命，我们提出了一种称为PCM-FTL的可感知写活动的PCM辅助闪存管理方案。通过区分顺序和随机I / O行为，开发了一种新颖的两级映射机制和一个定制的损耗均衡方案，以减少对PCM的写入并延长其寿命。我们评估具有各种通用和移动I / O工作负载的PCM-FTL。实验结果表明，PCM-FTL可以显着减少写入活动，并以非常低的开销实现PCM中写入的均匀分布。

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  • 作者

    Duo Liu; Kan Zhong; Tianzheng Wang; Yi Wang; Zili Shao; Edwin Hsing-Mean Sha; Jingling Xue;

  • 作者单位

    Key Laboratory of Dependable Service Computing in Cyber Physical Society, Ministry of Education, Chongqing University, Chongqing, China;

    Key Laboratory of Dependable Service Computing in Cyber Physical Society, Ministry of Education, Chongqing University, Chongqing, China;

    Department of Computer Science, University of Toronto, Toronto, ON, Canada;

    College of Computer Science & Software Engineering, Shenzhen University, Shenzhen, China;

    Department of Computing, the Hong Kong Polytechnic University, Hung Hom, Hong Kong;

    Key Laboratory of Dependable Service Computing in Cyber Physical Society, Ministry of Education, Chongqing University, Chongqing, China;

    School of Computer Science and Engineering, University of New South Wales, Sydney, NSW, Australia;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Phase change materials; Random access memory; Microprocessors; Embedded systems; Metadata; Memory management;

    机译：相变材料;随机存取存储器;微处理器;嵌入式系统;元数据;存储器管理;

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