A Tri-Pool Dynamic Wear-Leveling Algorithm for Large Scale Flash Memory Storage Systems

2011 ◽  
Author(s):  
S Teshome ◽  
Tae-Sun Chung
Keyword(s):  
Flash Memory ◽  
Large Scale ◽  
Storage Systems ◽  
Memory Storage ◽  
Wear Leveling ◽  
Dynamic Wear

AN EFFICIENT DYNAMIC WEAR LEVELING FOR HUGE-CAPACITY FLASH STORAGE SYSTEMS WITH CACHE

2012 ◽  
Vol 21 (04) ◽  
pp. 1250030 ◽  
Author(s):  
WEI-NENG WANG ◽  
KAI NI ◽  
JIAN-SHE MA ◽  
YI ZHAO ◽  
ZONG-CHAO WANG ◽  
...  
Keyword(s):  
Flash Memory ◽  
Storage Systems ◽  
Magnetic Media ◽  
Wear Leveling ◽  
Flash Storage ◽  
High Data ◽  
Storage Media ◽  
Shock Resistance ◽  
Dynamic Wear ◽  
Transmission Speed

Flash memory won its edge than other storage media for its advantages, such as shock resistance, low power consumption and high data transmission speed. However, new data is written out-of-place due to the characteristics of flash memory, which is diverse from traditional magnetic media. Out-of-place update results in the wear-leveling issue over flash memory for erasing blocks to reclaim invalid pages. This paper proposed a dynamic wear (DW)-leveling design without substantially increasing overhead and without modifying Flash Translation Layer (FTL) for huge-capacity flash storage systems with cache, which is based on segmentation threshold and Least Recently Used (LRU). Experimental results show that our design levels the wear of different physical blocks, reduces extra page coping and block erasing, and improves the read/write performance. Additionally, different thresholds impacting wear leveling are also discussed.

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