Clustering data according to update frequency to reduce garbage-collection overhead in solid-state drives

IEICE Electronics Express

Ilhoon Shin¹  Jaehyun Kim¹ 

[1] Department of Electronic Engineering, Seoul National University of Science & Technology

关键词: flash translation layer;    NAND flash memory;    garbage collection;    hot/cold;    update frequency;   

DOI  :  10.1587/elex.12.20150984

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(11)Garbage collection, which entails multiple page copies and a block erase, is a major source of performance fluctuation and degradation for NAND flash memory-based solid-state drives. This work aims to reduce its overhead by generating a skewed distribution of valid pages over all the blocks. Therefore, we propose classifying data as hot, warm, or cold according to their update frequencies, and to cluster them into different blocks. Our performance evaluation shows that the proposed scheme reduces the total garbage-collection count up to 43.4%, compared to the original page-mapping scheme, for an average performance improvement of up to 34.5% without any additional memory overhead.

【 授权许可】

Unknown