Shingled Magnetic Recording (SMR) Disks are adopted as a high-density, non-volatile media that significantly precedes conventional disks in both the storage capacity and cost. However, inefficient read-modify-writes (RMWs) greatly challenge the management of SMR disks. This article for the first time presents an approach called Tiler to manage SMR disks by dividing the physical space into small autonomous regions (ARs). Each AR can manage its space allocation, address mapping, and cleaning independently. By managing these ARs in a log-structured way, RMWs can be avoided; besides, ARs can also help update data when the adjacent tracks contain no valid data. Tiler is capable of partitioning a large-scale cleaning into self-contained-small-scale cleaning and thus, the data that need to be relocated are limited inside independent ARs, which further minimizes the performance overhead. Our experimental results show that Tiler can shorten the overall system response time by 50.21 percent and reduce the cleaning time by 90.24 percent on average.

中文翻译：

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Tiler：基于自治区域的 SMR 存储方案


叠瓦式磁记录 (SMR) 磁盘作为一种高密度、非易失性介质，在存储容量和成本方面均明显优于传统磁盘。然而，低效的读-修改-写（RMW）给SMR磁盘的管理带来了极大的挑战。本文首次提出一种称为 Tiler 的方法，通过将物理空间划分为小的自治区域 (AR) 来管理 SMR 磁盘。每个AR可以独立管理其空间分配、地址映射和清理。通过以日志结构的方式管理这些AR，可以避免RMW；此外，当相邻磁道不包含有效数据时，AR还可以帮助更新数据。 Tiler能够将大规模清理划分为独立的小规模清理，因此需要重新定位的数据被限制在独立的AR内，这进一步最小化了性能开销。我们的实验结果表明，Tiler 可以将整个系统响应时间缩短 50.21%，平均减少清洁时间 90.24%。