TY  - JOUR
T1  - Sequentiality-Aware Hash-based FTL
AU  - Shin, Jaemin 
AU  - Jeong, Ilbo 
AU  - Xiaochang, Li 
AU  - Kim, Jihong 
JO  - Journal of KIISE, JOK
PY  - 2020
DA  - 2020/1/14
DO  - 10.5626/JOK.2020.47.8.717
KW  - SSD
KW  - caching-based scheme
KW  - hash based scheme
KW  - flash translation layer
KW  - garbage collection
AB  - As the capacity of an SSD significantly increases, the SSD needs a larger DRAM for managing SSD-internal information. Since the cost of DRAM is an important factor in deciding the overall SSD price, it is important to reduce the DRAM cost without a performance degradation. In this paper, we propose a novel hash-based FTL mapping technique that meets this goal. Unlike an existing hash-based scheme, our technique introduces a virtual block scheme which enables to exploit the sequentiality of the logical address which effectively reduces the garbage collection overhead. Experimental results showed that SEQhFTL can reduce this overhead as much as PFTL while only maintaining 39% of PFTL’s metadata used on average.