High-Performance Scalable Flash File System Using Virtual Metadata Storage with Phase-Change RAM

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Several flash file systems have been developed based on the physical characteristics of NAND flash memory. However, previous flash file systems have performance overhead and scalability problems caused by metadata management in NAND flash memory. In this paper, we present a flash file system called PFFS2. PFFS2 stores all metadata into virtual metadata storage, which employs Phase-change RAM (PRAM). PRAM is a next-generation nonvolatile memory and will be good for dealing with word-level read/write of small-size data. Based on the virtual metadata storage, PFFS2 can manage metadata in a virtually fixed location and through byte-level in-place updates. Therefore, the performance of PFFS2 is 38 percent better than YAFFS2 for small file read/write while matching YAFFS2 performance for large file. Virtual metadata storage is particularly effective in decreasing the burden of computational and I/O overhead of garbage collection. In addition, PFFS2 maintains a 0.18 second mounting time and 284 KB memory usage in spite of increases in NAND flash memory size. We also propose a wear-leveling solution for PRAM in virtual metadata storage and greatly reduce the total write count of NAND flash memory. In addition, the life span of PFFS2 is longer than other flash file systems.
Publisher
IEEE COMPUTER SOC
Issue Date
2011-03
Language
English
Article Type
Article
Keywords

MEMORY; DESIGN

Citation

IEEE TRANSACTIONS ON COMPUTERS, v.60, no.3, pp.321 - 334

ISSN
0018-9340
DOI
10.1109/TC.2010.135
URI
http://hdl.handle.net/10203/95061
Appears in Collection
EE-Journal Papers(저널논문)
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