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首页> 外文期刊>Journal of systems architecture >Mitigating write amplification issue of SMR drives via the design of sequential-write-constrained cache
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Mitigating write amplification issue of SMR drives via the design of sequential-write-constrained cache

机译：通过设计顺序写入约束缓存来缓解SMR驱动器的写入放大问题

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Shingled magnetic recording (SMR) is widely considered as a promising storage technology for fulfilling the capacity requirement of next-generation big data applications. However, owing to the sequential-write constraint imposed by the shingled track layout of SMR drives, random-write requests can only be achieved through readmerge-write operations, which lead to considerable write amplification. An on-disk persistent cache area is used in SMR drives to absorb the random-write requests. However, because of the inherent sequential-write constraint, the on-disk persistent cache area cannot absorb duplicate write traffic through in-place overwriting. Such observation motivates us to propose a sequential-write-constrained cache (SWC2) management to mitigate the write amplification issue of SMR drives with the cached data hotness consideration. The proposed strategy is implemented within the Linux system and the experimental results showed that the overall write latency and cache cleaning latency is reduced by an average of 23.47% and 51.67%, respectively.
机译：Shingled磁记录（SMR）被广泛认为是满足下一代大数据应用的容量要求的有前途的存储技术。然而，由于SMR驱动器的滞后跟踪布局施加的顺序写入约束，只能通过ReadMerge-Write操作实现随机写入请求，这导致了相当大的写入放大。在SMR驱动器中使用磁盘持久缓存区域以吸收随机写入请求。但是，由于固有的顺序写入约束，磁盘持久缓存区域无法通过就地覆盖来吸收重复的写入流量。这种观察激励我们提出了一个顺序写入约束的高速缓存（SWC2）管理，以利用缓存的数据热度考虑来减轻SMR驱动器的写入放大问题。所提出的策略在Linux系统中实施，实验结果表明，总写入等待时间和缓存清洁等待时间分别降低了23.47％和51.67％。

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