| 摘要 |
PURPOSE:To attain an access to a file at a high speed by reducing the traffic between the networks in a decentralized system. CONSTITUTION:A disk cache 22 is shared by plural client computers 1 and stores the block of a file contained in a disk device 33 and the information on the block. A cashe control means 21 compares the block information on a file read request given from the computer 1 with the block information stored in the cashe 22 to decide the validity of the cache of the block to be read. Then the means 21 produces a file read request to a server computer 3 only when the cache valibility is not confirmed. Furthermore the means 21 writes the writing subject block related to the file write request given from the computer 1 and stores the new information on the block to be written into the cashe 22.
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