TY - GEN
T1 - Hybrid solid-state disks
AU - Chang, Li-Pin
PY - 2008/8/21
Y1 - 2008/8/21
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=49549089019&partnerID=8YFLogxK
U2 - 10.1109/ASPDAC.2008.4483988
DO - 10.1109/ASPDAC.2008.4483988
M3 - Conference contribution
AN - SCOPUS:49549089019
SN - 9781424419227
T3 - Proceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC
SP - 428
EP - 433
BT - 2008 Asia and South Pacific Design Automation Conference, ASP-DAC
Y2 - 21 March 2008 through 24 March 2008
ER -