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Issue No. 06 - June (2009 vol. 58)
ISSN: 0018-9340
pp: 744-758
Sooyong Kang , Hanyang University, Seoul
Sungmin Park , Hanyang University, Seoul
Hoyoung Jung , Hanyang University, Seoul
Hyoki Shim , Hanyang University, Seoul
Jaehyuk Cha , Hanyang University, Seoul
While NAND flash memory is used in a variety of end-user devices, it has a few disadvantages, such as asymmetric speed of read and write operations, inability to in-place updates, among others. To overcome these problems, various flash-aware strategies have been suggested in terms of buffer cache, file system, FTL, and others. Also, the recent development of next-generation nonvolatile memory types such as MRAM, FeRAM, and PRAM provide higher commercial value to Non-Volatile RAM (NVRAM). At today's prices, however, they are not yet cost-effective. In this paper, we suggest the utilization of small-sized, next-generation NVRAM as a write buffer to improve the overall performance of NAND flash memory-based storage systems. We propose various block-based NVRAM write buffer management policies and evaluate the performance improvement of NAND flash memory-based storage systems under each policy. Also, we propose a novel write buffer-aware flash translation layer algorithm, optimistic FTL, which is designed to harmonize well with NVRAM write buffers. Simulation results show that the proposed buffer management policies outperform the traditional page-based LRU algorithm and the proposed optimistic FTL outperforms previous log block-based FTL algorithms, such as BAST and FAST.
Nonvolatile RAM, flash memory, write buffer, flash translation layer, solid-state disk, storage device.

J. Cha, S. Kang, H. Shim, H. Jung and S. Park, "Performance Trade-Offs in Using NVRAM Write Buffer for Flash Memory-Based Storage Devices," in IEEE Transactions on Computers, vol. 58, no. , pp. 744-758, 2008.
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