A Scalable and Highly Configurable Cache-Aware Hybrid Flash Translation Layer

Computers

Jalil Boukhobza¹  Pierre Olivier² 

[1] University Bretagne Occidentale, UMR 6285, Lab-STICC, F-29200 Brest, France;

关键词: NAND flash memory;    hybrid-mapping;    flash translation layer;    cache;    solid state drives;   

DOI  :  10.3390/computers3010036

来源: mdpi

【 摘 要 】

This paper presents a cache-aware configurable hybrid flash translation layer (FTL), named CACH-FTL. It was designed based on the observation that most state-of­­-the-art flash-specific cache systems above FTLs flush groups of pages belonging to the same data block. CACH-FTL relies on this characteristic to optimize flash write operations placement, as large groups of pages are flushed to a block-mapped region, named BMR, whereas small groups are buffered into a page-mapped region, named PMR. Page group placement is based on a configurable threshold defining the limit under which it is more cost-effective to use page mapping (PMR) and wait for grouping more pages before flushing to the BMR. CACH-FTL is scalable in terms of mapping table size and flexible in terms of Input/Output (I/O) workload support. CACH-FTL performs very well, as the performance difference with the ideal page-mapped FTL is less than 15% in most cases and has a mean of 4% for the best CACH-FTL configurations, while using at least 78% less memory for table mapping storage on RAM.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.