Abstract
Today, flash memory is widely used for various kinds of products. Unlike a hard disk, it has neither mechanical parts nor seek-delay. Therefore, a user may expect steady performance under disk fragmentation in flash storage. However, most commercial products do not satisfy this expectation. For example, a SDMMC card can be written in 18.7Mbytes/sec speed sequentially, but its write speed is slowed down to 3.2Mbytes/sec when it is seriously fragmented. It is only 18% of the original performance. In this paper, we analyze the reason for performance degradation in a flash disk, and propose an FTL level optimization technique, named the page padding method, to lessen the fragmentation effect. We applied the technique to the Log-block FTL algorithm and showed that it can enhance write performance by 150% in a severely fragmented flash disk. © Springer-Verlag Berlin Heidelberg 2007.
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CITATION STYLE
Kim, H., Kim, J. H., Choi, S. H., Jung, H. R., & Jung, J. G. (2007). A page padding method for fragmented flash storage. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 4705 LNCS, pp. 164–177). Springer Verlag. https://doi.org/10.1007/978-3-540-74472-6_13
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