A comprehensive study of energy efficiency and performance of flash-based SSD

Authors:
Seonyeong Park;Youngjae Kim;Bhuvan Urgaonkar;Joonwon Lee;Euiseong Seo
Affiliations:
Division of Computer Science, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea;National Center for Computational Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;Department of Computer Science and Engineering, The Pennylvania State University, University Park, PA 16803, USA;School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Republic of Korea;School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
Venue:
Journal of Systems Architecture: the EUROMICRO Journal
Year:
2011

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Abstract

Use of flash memory as a storage medium is becoming popular in diverse computing environments. However, because of differences in interface, flash memory requires a hard-disk-emulation layer, called FTL (flash translation layer). Although the FTL enables flash memory storages to replace conventional hard disks, it induces significant computational and space overhead. Despite the low power consumption of flash memory, this overhead leads to significant power consumption in an overall storage system. In this paper, we analyze the characteristics of flash-based storage devices from the viewpoint of power consumption and energy efficiency by using various methodologies. First, we utilize simulation to investigate the interior operation of flash-based storage of flash-based storages. Subsequently, we measure the performance and energy efficiency of commodity flash-based SSDs by using microbenchmarks to identify the block-device level characteristics and macrobenchmarks to reveal their filesystem level characteristics.