Journal remap-based FTL for journaling file system with flash memory

  • Authors:

  • Seung-Ho Lim;Hyun Jin Choi;Kyu Ho Park

  • Affiliations:

  • Computer Engineering Research Laboratory, Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Daejon, South Korea;Computer Engineering Research Laboratory, Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Daejon, South Korea;Computer Engineering Research Laboratory, Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Daejon, South Korea

  • Venue:
  • HPCC'07 Proceedings of the Third international conference on High Performance Computing and Communications
  • Year:
  • 2007

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Abstract

Constructing flash memory based storage, FTL (Flash Translation Layer) manages mapping between logical address and physical address. Since FTL writes every data to newregion by itsmappingmethod, the previous data is not overwritten by new write operation.When a journaling file system is set up upon FTL, it duplicates data between the journal region and its home location for the file system consistency. However, the duplication degrades the performance. In this paper, we present an efficient journal remap-based FTL. The proposed FTL, called JFTL, eliminates the redundant data duplication by remapping the journal region data path to home location of file system. Thus, our JFTLcan prevent from degrading write performance of file system while preserving file system consistency.