Compression ratio based hot/cold data identification for flash memory

Abstract

This paper presents a hot/cold data identification technique for NAND flash storage systems. The proposed technique uses both compression ratio and sector size of requested data as identification criteria. In order to avoid high overhead due to compression process, the technique determines compression ratio using a fraction of data. The experimental results show that this technique contributes to effectively identify hot data and when used in buffer management to increase the hit rate effectively.