| 摘要 |
PROBLEM TO BE SOLVED: To enhance performance concerning responsiveness to a host computer, relating to a path redundancy device and method for use with a disk array device or the like to switch the pass of data input/output. SOLUTION: A path redundancy driver 4 is used for a disk array device 9 which controls the recording and reproduction of data to and from logic discs 70-72 by means of controllers 10, 20 having cache memories 15, 25, and which writes data into the cache memories 15, 25 when the data are written on the logic discs 70-72. The path redundancy driver has the function of allocating the path of read data transfer and the path of write data transfer to each of the controllers 10, 20. The write data transfer is executed only by the specific controller 10 (or 20). As a result, competition is avoided as to the double writing of the write data into the cache memories 15, 25. COPYRIGHT: (C)2004,JPO
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