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An Efficient Copy-Back Operation Scheme Using Dedicated Flash Memory Controller in Solid-State Disks

Woo Tae Chang 1,2, Yong Tae Lim 2, and Jun Dong Cho 1
1. Sungkyunkwan University, Suwon, Korea
2. Samsung Electronics Co. Ltd., Hwasung, Korea
Abstract—Today, flash memory is widely used as storage media in diverse computing environments. Several merits of flash memory such as small form-factor without any mechanical component, high performance and low power consumption replace magnetic storage media. However, flash memory requires emulator called flash translation layer (FTL) to use a common storage media such as hard disk drive (HDD). Merge operation of FTL including copy-back operation reduces the performance of SSD. To address this performance degradation in merge operation, this paper proposes an efficient copy-back operation using flash memory controller in hardware which reduces the merge time and improves FTL performance. Experimental results show that the proposed scheme improves 9% random write I/O performance (IOPS) of SSD compared to the existing technique.

Index Terms—flash memory, flash translation layer, hard disk drive, Solid-state disk, merge operation, copy-back operation, flash memory controller, IOPS

Cite: Woo Tae Chang , Yong Tae Lim, and Jun Dong Cho, "An Efficient Copy-Back Operation Scheme Using Dedicated Flash Memory Controller in Solid-State Disks," International Journal of Electrical Energy, Vol. 2, No. 1, pp. 13-17, March 2014. doi: 10.12720/ijoee.2.1.13-17
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