| 摘要 |
A file system that reads a file, in response to a request from a user, from an external storage, transfers the read file to the user, and also stores a copy of the read file in a cache memory in consideration of the file's frequency in access so that the cache hit ratio may be improved. In response to a following request for the file stored in both the memory and the external storage, the file system transfers, to the user, the copy file stored in the memory instead of the file stored in the external storage in order to speed up the file access processing. The file system ejects a file having the least access count among the files stored in the memory when there is no space for storing the copy file in the memory.
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