NVRAM-Aware Mapping Table Management for Flash Storage Devices

Yongju SONG  Sungkyun LEE  Dong Hyun KANG  Young Ik EOM  

IEICE TRANSACTIONS on Information and Systems   Vol.E102-D   No.8   pp.1576-1580
Publication Date: 2019/08/01
Publicized: 2019/04/26
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2019EDL8022
Type of Manuscript: LETTER
Category: Data Engineering, Web Information Systems
flash storage,  L2P mapping table,  synchronization command,  non-volatile RAM,  

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Flash storage suffers from severe performance degradation due to its inherent internal synchronization overhead. Especially, flushing an L2P (logical address to physical address) mapping table significantly contributes to the performance degradation. To relieve the problem, we propose an efficient L2P mapping table management scheme on the flash storage, which works along with a small-sized NVRAM. It flushes L2P mapping table from DRAM to NVRAM or flash memory selectively. In our experiments, the proposed scheme shows up to 9.37× better performance than conventional schemes.