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I/O Optimizations for Hybrid File System Integrated with NAND-Flash SSD

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As the technology of NAND flash memory rapidly grows, SSD is becoming an excellent alternative for storage solutions, due to its high random I/O throughput and low power consumption. These SSD potentials have drawn great attention from IT enterprises that seek for better I/O performance. However, high SSD cost per capacity makes it less desirable to construct a large-scale storage subsystem solely composed of SSDs. An alternative is to build a hybrid storage subsystem where both HDD and SSD are incorporated in an economic manner, while employing the strengths of both devices. This paper presents a hybrid file system, called NF-hybrid (New Form of hybrid), that attempts to utilize the advantages of both HDD and SSD, to provide a single, virtual address space. Especially, NF-hybrid proposes I/O optimizations that contribute to generate better I/O performance, while addressing the restricted SSD storage capacity. Several performance evaluations were conducted to verify the effectiveness and suitability of NF-hybrid.

Document Type: Research Article


Publication date: July 1, 2012

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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