Hybrid solid-state disks: Combining heterogeneous NAND flash in large SSDs

Li-Pin Chang

doi:10.1109/ASPDAC.2008.4483988

Hybrid solid-state disks: Combining heterogeneous NAND flash in large SSDs

Li-Pin Chang^*

^*Corresponding author for this work

Department of Computer Science

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

89 Scopus citations

Abstract

NAND-flash-based SSDs (solid-state disks) are recently used in embedded computers to replace power-hungry disks. This paper presents a hybrid approach to large SSDs, which combines MLC flash and SLC flash. The idea is to complement the drawbacks of the two kinds of NAND flash with each other's advantages. The technical issues of the design of a hybrid SSD pertain to data placement and wear leveling over heterogeneous NAND flash. Our experimental results show that, by adding a 256 MB SLC flash to a 20 GB MLC-flash array, the hybrid SSD improves over a conventional SSD by 4.85 times in terms of average response. The average throughput and energy consumption are improved by 17 % and 14%, respectively. The hybrid SSD is only 2% more expensive than a purely MLC-flash-based SSD, for which the extra cost is limited and very rewarded.

Original language	English
Title of host publication	2008 Asia and South Pacific Design Automation Conference, ASP-DAC
Pages	428-433
Number of pages	6
DOIs	https://doi.org/10.1109/ASPDAC.2008.4483988
State	Published - 21 Aug 2008
Event	2008 Asia and South Pacific Design Automation Conference, ASP-DAC - Seoul, Korea, Republic of Duration: 21 Mar 2008 → 24 Mar 2008

Publication series

Name	Proceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC

Conference

Conference	2008 Asia and South Pacific Design Automation Conference, ASP-DAC
Country	Korea, Republic of
City	Seoul
Period	21/03/08 → 24/03/08

Access to Document

10.1109/ASPDAC.2008.4483988

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Cite this

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title = "Hybrid solid-state disks: Combining heterogeneous NAND flash in large SSDs",

abstract = "NAND-flash-based SSDs (solid-state disks) are recently used in embedded computers to replace power-hungry disks. This paper presents a hybrid approach to large SSDs, which combines MLC flash and SLC flash. The idea is to complement the drawbacks of the two kinds of NAND flash with each other's advantages. The technical issues of the design of a hybrid SSD pertain to data placement and wear leveling over heterogeneous NAND flash. Our experimental results show that, by adding a 256 MB SLC flash to a 20 GB MLC-flash array, the hybrid SSD improves over a conventional SSD by 4.85 times in terms of average response. The average throughput and energy consumption are improved by 17 % and 14%, respectively. The hybrid SSD is only 2% more expensive than a purely MLC-flash-based SSD, for which the extra cost is limited and very rewarded.",

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Chang, L-P 2008, Hybrid solid-state disks: Combining heterogeneous NAND flash in large SSDs. in 2008 Asia and South Pacific Design Automation Conference, ASP-DAC., 4483988, Proceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC, pp. 428-433, 2008 Asia and South Pacific Design Automation Conference, ASP-DAC, Seoul, Korea, Republic of, 21/03/08. https://doi.org/10.1109/ASPDAC.2008.4483988

Hybrid solid-state disks : Combining heterogeneous NAND flash in large SSDs. / Chang, Li-Pin.

2008 Asia and South Pacific Design Automation Conference, ASP-DAC. 2008. p. 428-433 4483988 (Proceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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