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

Li-Pin Chang*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

90 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 languageEnglish
Title of host publication2008 Asia and South Pacific Design Automation Conference, ASP-DAC
Pages428-433
Number of pages6
DOIs
StatePublished - 21 Aug 2008
Event2008 Asia and South Pacific Design Automation Conference, ASP-DAC - Seoul, Korea, Republic of
Duration: 21 Mar 200824 Mar 2008

Publication series

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

Conference

Conference2008 Asia and South Pacific Design Automation Conference, ASP-DAC
CountryKorea, Republic of
CitySeoul
Period21/03/0824/03/08

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