Improving performance and lifetime of the SSD RAID-based host cache through a log-structured approach

Y. Oh, Jongmoo Choi, Donghee Lee, S. Noh
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引用次数: 2

Abstract

This paper proposes a cost-effective and reliable SSD host cache solution that we call SRC (SSD RAID Cache). Costeffectiveness is brought about by using multiple low-cost SSDs and reliability is enhanced through RAID-based data redundancy. RAID, however, is managed in a log-structured manner on multiple SSDs effectively eliminating the detrimental read-modify-write operations found in conventional RAID-5. Within the proposed framework, we also propose to eliminate parity blocks for stripes that are composed of clean blocks as the original data resides in primary storage. We also propose the use of destaging, instead of garbage collection, to make space in the cache when the SSD cache is full. We show that the proposed techniques have significant implications on the performance of the cache and lifetime of the SSDs that comprise the cache. Finally, we study various ways in which stripes can be formed based on data and parity block allocation policies. Our experimental results using different realistic I/O workloads show using the SRC scheme is on average 59% better than the conventional SSD cache scheme supporting RAID-5. In case of lifetime, our results show that SRC reduces the erase count of the SSD drives by an average of 47% compared to the RAID-5 scheme.
通过日志结构化方法提高基于SSD raid的主机缓存的性能和生命周期
本文提出了一种经济可靠的SSD主机缓存解决方案,我们称之为SRC (SSD RAID cache)。通过使用多个低成本的ssd盘来提高成本效益,并通过基于raid的数据冗余来提高可靠性。但是,RAID在多个ssd上以日志结构的方式进行管理,有效地消除了传统RAID-5中存在的有害的读-修改-写操作。在提出的框架内,我们还建议消除由干净块组成的条带的奇偶校验块,因为原始数据驻留在主存储中。我们还建议使用删除而不是垃圾收集,以便在SSD缓存已满时在缓存中腾出空间。我们表明,所提出的技术对缓存的性能和组成缓存的ssd的寿命有重大影响。最后,我们研究了基于数据和奇偶块分配策略形成条纹的各种方法。我们使用不同实际I/O工作负载的实验结果表明,使用SRC方案比支持RAID-5的传统SSD缓存方案平均要好59%。就寿命而言,我们的结果表明,与RAID-5方案相比,SRC将SSD驱动器的擦除计数平均减少了47%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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