A PRAM and NAND flash hybrid architecture for high-performance embedded storage subsystems

NAND flash-based storage is widely used in embedded systems due to its numerous benefits: low cost, high density, small form factor and so on. However, NAND flash-based storage is still suffering from serious performance degradation for random or small size write access. This degradation mainly comes from the physical constraints of NAND flash: erase-before-program and different unit size of erase and program operations. To overcome these constraints, we propose to use PRAM (Phase-change RAM) which supports advanced features: fast byte access capability and no requirement for erase-before-program. In this paper, we focus on developing a high-performance NAND flash-based storage system by maximally exploiting the advanced feature of PRAM, in terms of performance and wearing out. To do this, we first propose a new hybrid storage architecture which consists of PRAM and NAND flash. Second, we devise two novel software schemes for the proposed hybrid storage architecture; FSMS (File System...

• Type: Conference
• Year: 2008
• Where: EMSOFT
• Authors: Jin Kyu Kim, Hyung Gyu Lee, Shinho Choi, Kyoung Il Bahng
• Keywords: EMSOFT 2008, Flash Translation Layer, Hybrid Storage Architecture, NAND Flash-based Storage, Software Engineering