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arXiv 1502.02239cs.AR
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采用双数据率NAND闪存的高性能固态硬盘

A High-Performance Solid-State Disk with Double-Data-Rate NAND Flash Memory

Eui-Young Chung, Chang-Il Son, Kwanhu Bang, Dong Kim, Soong-Mann Shin, Sungroh Yoon

摘要:

我们提出了一种新的固态硬盘(SSD)架构,利用双数据速率同步NAND闪存接口,提高读写性能。与传统设计不同,在所提出的设计中,数据传送率与同步信令协调地加倍。新的架构不需要任何额外的引脚相对于传统的架构,从而保证向后兼容性。对于性能评估,我们模拟了各种SSD设计,采用所提出的架构,并测量其性能的读/写带宽和能耗。考虑了NAND闪存单元类型,即单级单元(SLC)和多级单元(MLC)。在使用SLC型NAND闪存芯片的实验中,所提出的架构的读取和写入速度分别是传统架构的1.65-2.76倍和1.09-2.45倍。类似的改进被观察到的MLC为基础的架构测试。将所提出的架构与多路复用控制器和每个闪存芯片之间的数据通道的方式交织技术相结合特别有效。对于一个合理的高度的方式交织,读/写性能和能量消耗的方法是显着优于传统的设计。

英文摘要:

We propose a novel solid-state disk (SSD) architecture that utilizes a double-data-rate synchronous NAND flash interface for improving read and write performance. Unlike the conventional design, the data transfer rate in the proposed design is doubled in harmony with synchronous signaling. The new architecture does not require any extra pins with respect to the conventional architecture, thereby guaranteeing backward compatibility. For performance evaluation, we simulated various SSD designs that adopt the proposed architecture and measured their performance in terms of read/write bandwidths and energy consumption. Both NAND flash cell types, namely single-level cells (SLCs) and multi-level cells (MLCs), were considered. In the experiments using SLC-type NAND flash chips, the read and write speeds of the proposed architecture were 1.65-2.76 times and 1.09-2.45 times faster than those of the conventional architecture, respectively. Similar improvements were observed for the MLC-based architectures tested. It was particularly effective to combine the proposed architecture with the way-interleaving technique that multiplexes the data channel between the controller and each flash chip. For a reasonably high degree of way interleaving, the read/write performance and the energy consumption of our approach were notably better than those of the conventional design.

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