標題: A Hybrid Approach to NAND-Flash-Based Solid-State Disks
作者: Chang, Li-Pin
資訊工程學系
Department of Computer Science
關鍵字: Flash memory;storage systems;file systems;solid-state disks
公開日期: 1-十月-2010
摘要: Replacing power-hungry disks with NAND-flash-based solid-state disks (SSDs) is a recently emerging trend in flash-memory applications. One important SSD design issue is achieving a good balance between cost, performance, and lifetime. This study introduces a hybrid approach to large SSDs that combines MLC NAND flash and SLC NAND flash. Each of these flash architectures has its own drawbacks and benefits, and this study proposes that the two can complement each other. However, there are technical challenges pertaining to data placement, data migration, and wear leveling in heterogeneous NAND flash. The experimental results of our study show that combining 256 MB SLC flash with 20 GB MLC flash produces a hybrid SSD. This hybrid SSD is 1.8 times faster than a purely MLC-flash-based SSD in terms of average response time and improves energy consumption by 46 percent. The proposed hybrid SSD costs only four percent more than a purely MLC-flash-based SSD. The extra cost of a hybrid SSD is very limited and rewarding.
URI: http://dx.doi.org/10.1109/TC.2010.14
http://hdl.handle.net/11536/150050
ISSN: 0018-9340
DOI: 10.1109/TC.2010.14
期刊: IEEE TRANSACTIONS ON COMPUTERS
Volume: 59
起始頁: 1337
結束頁: 1349
顯示於類別:期刊論文