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Design and Implementation of a Hybrid Shingled Write Disk System

机译：混合瓦式写磁盘系统的设计与实现

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Disk data density improvement will eventually be limited by the super-paramagnetic effect for perpendicular recording. While various approaches to this problem have been proposed, Shingled Magnetic Recording (SMR) holds great promise to mitigate the problem of density scaling cost-effectively by overlapping data tracks. However, the inherent properties of SMR limit Shingled Write Disk (SWD) applicability since writing data to one track destroys the data previously-stored on the overlapping tracks. As a result, various data layout management designs have been proposed. In this paper, we present a hybrid wave-like shingled recording (HWSR) disk system, which can improve both the performance and the capacity of a shingled write disk. We propose a novel segment-based data layout management and a new wave-like shingled recording that overlaps adjacent tracks from two opposite radial directions. This new scheme can not only efficiently reduce the write amplification, but also double the areal density of conventional circular log-based shingled recording. A new replacement policy based on least write amplification is also devised to manage the hybrid system to effectively eliminate the performance degradation. Our measurements on HWSR implemented in Linux kernel 2.6.35.6 show that it provides superb performance. For example, HWSR reduces the average I/O response time by an order of magnitude compared to S-block for trace, and provides up to 3.7 speedup over standard hard disks without using shingled magnetic recording technology.
机译：磁盘数据密度的提高最终将受到垂直记录的超顺磁效应的限制。尽管已经提出了解决该问题的各种方法，但是带盖磁记录（SMR）寄予了巨大希望，可以通过重叠数据磁道以成本有效的方式减轻密度缩放的问题。但是，由于将数据写入一个磁道会破坏先前存储在重叠磁道上的数据，因此SMR的固有属性限制了带叠写磁盘（SWD）的适用性。结果，已经提出了各种数据布局管理设计。在本文中，我们提出了一种混合波浪状的带状记录（HWSR）磁盘系统，它可以同时改善带状写入磁盘的性能和容量。我们提出了一种新颖的基于段的数据布局管理和一种新的波浪状带状记录，该记录与来自两个相反径向方向的相邻磁道重叠。这种新方案不仅可以有效地减少写入放大，而且可以使传统的基于圆形对数的叠片式记录的面密度提高一倍。还设计了基于最小写放大的新替换策略来管理混合系统，以有效消除性能下降。我们对在Linux内核2.6.35.6中实现的HWSR的测量表明，它提供了出色的性能。例如，与用于跟踪的S块相比，HWSR将平均I / O响应时间减少了一个数量级，并且在不使用混合磁记录技术的情况下，与标准硬盘相比，HWSR的速度提高了3.7。

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