SMRTS: A Performance and Cost-Effectiveness Optimized SSD-SMR Tiered File System with Data Deduplication
SMRTS: A Performance and Cost-Effectiveness Optimized SSD-SMR Tiered File System with Data Deduplication
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DOI：
10.1109/iccd58817.2023.00050
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发表时间：
2023-11
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影响因子：
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通讯作者：
Zhichao Cao;Hao Wen;Fenggang Wu;David Hung-Chang Du
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文献类型：
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作者：
Zhichao Cao;Hao Wen;Fenggang Wu;David Hung-Chang Du
存储分层（例如，SSD+HDD）的设计是为了在存储系统的性能和成本效益之间实现更好的权衡。随着Shingled磁记录（SMR）驱动器的发展，在分层存储中用更高密度的SMR驱动器取代传统的HDD可以进一步提高成本效益。然而，由于数据轨迹在SMR驱动器中重叠，SMR驱动器中的“非顺序”写入会导致明显的性能损失，这是在存储分层中使用SMR驱动器时最具挑战性的问题。本文提出了一种基于重复数据删除的SSD-SMR分级存储文件系统SMRTS。首先，SMRTS对从SSD迁移到SMR的文件进行重复数据删除，解决SMR驱动器的非顺序写问题，进一步优化空间利用率。其次，为了解决重复数据删除造成的性能开销，我们提出了文件配方重用和刷新、基于提示的容器分配和快速容器验证，以解决数据碎片造成的损失。我们使用基准测试和实际工作负载对SMRTS进行实验性评估。评估结果表明，与兼容SSD+HDD分级存储的文件系统相比，SMRTS的性能与SSD+HDD分级存储相当，但提供的空间要大得多（至少1.25倍）。建议的优化将迁移性能提高了17倍。
Storage tiering (e.g., SSD+HDD) is designed to achieve a better tradeoff between performance and cost-effectiveness for storage systems. With the development of Shingled Magnetic Recording (SMR) drives, replacing conventional HDD with a higher density of SMR drives in tiered storage can further improve cost-effectiveness. However, with data tracks overlapped in SMR drives, the "non-sequential' writes in SMR drives cause explicit performance penalties, which is the most challenging issue of using SMR drives in storage tiering.In this paper, we present SMRTS, a file system for SSD-SMR tiered storage with data deduplication. First, SMRTS deduplicates the files being migrated from SSD to SMR to solve the non-sequential write issue of SMR drives and further optimize the space utilization. Second, to address the performance overhead caused by deduplication, we propose file recipe reuse and refresh, hints-based container allocations, and fast container validation to address the penalties caused by data fragmentations. We conduct experimental evaluations of SMRTS using both benchmarks and real-world workloads. The evaluation results show that compared with a compatible file system on SSD+HDD tiered storage, SMRTS achieves a similar performance but provides a much larger space (at least 1.25X). The proposed optimizations improve migration performance up to 17X.