A Study of Background Cleaning and Data Allocation for Multi-Channel SSDs

被引：0

作者：

Wang, Ronghui ^{[1
]}

Cao, Ting ^{[1
]}

Yang, Ou ^{[1
]}

Xiao, Nong ^{[1
]}

Zhang, Minxuan ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Comp, Changsha, Hunan, Peoples R China

来源：

2013 2ND INTERNATIONAL SYMPOSIUM ON INSTRUMENTATION AND MEASUREMENT, SENSOR NETWORK AND AUTOMATION (IMSNA) | 2013年

关键词：

SSDs; multi-channel; background cleaning; allocation; write amplificatin;

D O I：

暂无

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Due to the idiosyncrasies of NAND flash memories, such as erase-before-write and bulk erase, SSDs employ an internal garbage collection process to recycle obsolete data to provide free spaces. To overlap the cleaning with I/O services in parallel units of multi-channel SSDs, a finer-granularity cleaning has been proposed, namely background cleaning. This method is not widely accepted for its reliability and wear-leveling problems. In this work, we study the background cleaning with different striping allocation policies, analyzing the SSD performance and write amplification with diverse cleaning units. Trace-driven simulations reveal that with certain striping allocation policies, finer-granularity cleaning can improve the SSD performance, as well as keep comparable cleaning efficiency, even without using the copy-back command.

引用

页码：817 / 820

页数：4

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