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首页> 外文会议>IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems >μCache: a mutable cache for SMR translation layer
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μCache: a mutable cache for SMR translation layer

机译：μCache：用于SMR翻译层的可变缓存

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Shingled Magnetic Recording (SMR) may be combined with conventional (re-writable) recording on the same drive; in host-managed drives shipping today this capability is used to provide a small number of re-writable zones, typically totaling a few tens of GB. Although these re-writable zones are widely used by SMR-aware applications, the literature to date has ignored them and focused on fully-shingled devices. We describe μCache, an SMR translation layer (STL) using re-writable (mutable) zones to take advantage of both workload spatial and temporal locality to reduce the garbage collection overhead resulted from out-of-place writes. In μCache the volume LBA space is divided into fixed -sized buckets and, on write access, the corresponding bucket is copied (promoted) to the re-writable zones, allowing subsequent writes to the same bucket be served in - place resulting in fewer garbage collection cycles. We evaluate μCache in simulation against real-world traces and show that with appropriate parameters it is able to hold the entire write working set of most workloads in re-writable storage, virtually eliminating garbage collection overhead. We also emulate μCache by replaying its translated traces against actual drive and show that 1) it outperforms its examined counterpart, an E-region based translation approach on average by 2x and up to 5.1x, and 2) it incurs additional latency only for a small fraction of write operations, (up to 10%) when compared with conventional non-shingled disks.
机译：凸型磁记录（SMR）可以与同一驱动器上的常规（可重标）记录相结合;在主机管理的驱动器中，今天这种功能用于提供少量可重标区，通常总计几十个GB。虽然SMR感知应用程序广泛使用这些可重转的区域，但迄今为止的文献已经忽略了它们并专注于完全滞后的设备。我们使用可重置（可变的）区域来描述μCCHACHE，SMR翻译层（STL），以利用工作负载空间和时间局部，以减少从出位的写入造成的垃圾收集开销。在μCache中，卷LBA空间分为固定的桶，并且在写入访问时，将相应的铲斗复制（促销）复制（促销），允许随后写入相同的桶中，从而导致更少的垃圾集合周期。我们评估μCache仿真对现实世界的迹线，并显示具有适当的参数，它能够将整个写作工作集的重用存储中的大多数工作负载保持在重写存储中，几乎消除了垃圾收集开销。我们还通过重播其翻译的痕迹来模拟μCache，并显示1）它占据了其检查的对应物，平均基于E-Region的转换方法平均2倍，最高可达5.1倍，而且仅引发了其他延迟与传统的非凸块磁盘相比，写操作的一小部分（高达10％）。

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