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The operating system

Time:09-25

1. If you are one of the operating system designers, take slow character device management task. The operating system requirements: the user use slow character device and use normal file exactly as convenient and simple. At least what problem to solve in the design, please
2. What are the main file system performance improvement method? On UNIX systems, which are utilized by raising the speed of the disk I/O method, try to illustrate respectively?
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