TY - GEN
T1 - Hybrid solid state drives for improved performance and enhanced lifetime
AU - Oh, Yongseok
AU - Lee, Eunjae
AU - Choi, Jongmoo
AU - Lee, Donghee
AU - Noh, Sam H.
PY - 2013
Y1 - 2013
N2 - As the market becomes more competitive, SSD manufacturers are moving from SLC (Single-Level Cell) to MLC (Multi-Level Cell) flash memory chips that store two bits per cell as building blocks for SSDs. Recently, TLC chips, which store three bits per cell, is being considered as a viable solution due to their low cost. However, performance and lifetime of TLC chips are considerably limited and thus, pure TLC-based SSDs may not be viable as a general storage device. In this paper, we propose a hybrid SSD solution, namely HySSD, where SLC and TLC chips are used together to form an SSD solution performing in par with SLC-based products. Based on an analytical model, we propose a near optimal data distribution scheme that distributes data among the SLC and TLC chips for a given workload such that performance or lifetime may be optimized. Experiments with two types of SSDs both based on DiskSim with SSD Extension show that the analytic model approach can dynamically adjust data distribution as workloads evolve to enhance performance or lifetime.
AB - As the market becomes more competitive, SSD manufacturers are moving from SLC (Single-Level Cell) to MLC (Multi-Level Cell) flash memory chips that store two bits per cell as building blocks for SSDs. Recently, TLC chips, which store three bits per cell, is being considered as a viable solution due to their low cost. However, performance and lifetime of TLC chips are considerably limited and thus, pure TLC-based SSDs may not be viable as a general storage device. In this paper, we propose a hybrid SSD solution, namely HySSD, where SLC and TLC chips are used together to form an SSD solution performing in par with SLC-based products. Based on an analytical model, we propose a near optimal data distribution scheme that distributes data among the SLC and TLC chips for a given workload such that performance or lifetime may be optimized. Experiments with two types of SSDs both based on DiskSim with SSD Extension show that the analytic model approach can dynamically adjust data distribution as workloads evolve to enhance performance or lifetime.
UR - http://www.scopus.com/inward/record.url?scp=84883062074&partnerID=8YFLogxK
U2 - 10.1109/MSST.2013.6558425
DO - 10.1109/MSST.2013.6558425
M3 - Conference contribution
AN - SCOPUS:84883062074
SN - 9781479902170
T3 - IEEE Symposium on Mass Storage Systems and Technologies
BT - 2013 IEEE 29th Symposium on Mass Storage Systems and Technologies, MSST 2013
T2 - 2013 IEEE 29th Symposium on Mass Storage Systems and Technologies, MSST 2013
Y2 - 6 May 2013 through 10 May 2013
ER -