Xuchao Xie, Liquan Xiao, D. H. Du
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引用次数: 1

摘要

集成固态硬盘(ssd)和主机感知的带状磁记录(HA-SMR)驱动器可以潜在地构建一个经济高效的高性能存储系统。然而,在这种混合系统中,现有的SSD分层和缓存设计并不能完全匹配HA-SMR驱动器的固有特性,因为它们没有考虑如何处理非顺序写(nsw)。我们提出了基于区域的存储分层和缓存协同设计ZoneTier,通过利用HA-SMR驱动器的主机感知特性来有效控制所有nsw。ZoneTier利用SMR分区的实时数据布局优化分区布局,将分区降级产生的nsw重塑为SMR优先顺序写,并将不可避免的nsw转换为SMR分区的清洁友好写流量。ZoneTier可以很容易地扩展,以匹配主机管理的SMR驱动器使用主动清洁策略。我们使用用户空间数据管理算法和真实的SSD和HA-SMR驱动器实现了ZoneTier的原型,这些驱动器由libzbc和libaio提供的功能进行操作。实验表明,与现有的混合存储设计相比,ZoneTier可以平均减少29.41%的区域迁移开销,缩短HA-SMR驱动器清理后的性能恢复时间,最多可缩短33.37%,提高32.31%的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ZoneTier
Integrating solid-state drives (SSDs) and host-aware shingled magnetic recording (HA-SMR) drives can potentially build a cost-effective high-performance storage system. However, existing SSD tiering and caching designs in such a hybrid system are not fully matched with the intrinsic properties of HA-SMR drives due to their lacking consideration of how to handle non-sequential writes (NSWs). We propose ZoneTier, a zone-based storage tiering and caching co-design, to effectively control all the NSWs by leveraging the host-aware property of HA-SMR drives. ZoneTier exploits real-time data layout of SMR zones to optimize zone placement, reshapes NSWs generated from zone demotions to SMR preferred sequential writes, and transforms the inevitable NSWs to cleaning-friendly write traffics for SMR zones. ZoneTier can be easily extended to match host-managed SMR drives using proactive cleaning policy. We implemented a prototype of ZoneTier with user space data management algorithms and real SSD and HA-SMR drives, which are manipulated by the functions provided by libzbc and libaio. Our experiments show that ZoneTier can reduce zone relocation overhead by 29.41% on average, shorten performance recovery time of HA-SMR drives from cleaning by up to 33.37%, and improve performance by up to 32.31% than existing hybrid storage designs.
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