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Since the emergence of solid state devices onto the storage scene, improvements in capacity and price have brought them to the point where they are becoming a viable alternative to traditional magnetic storage for some applications. Current file system and device level I/O scheduler design is optimized for rotational magnetic hard disk drives. Since solid state devices have drastically different properties and structure, the authors may need to rethink the design of some aspects of the file system and scheduler levels of the I/O subsystem. In this paper, they consider the current approach to I/O scheduling and show that the current scheduler design may not be ideally suited to solid state devices.
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