| 摘要 |
PURPOSE:To increase the disk input/output processing speed by dividing the area of one disk device and simultaneously performing the seek and search operation and the data transfer between a disk cache and a channel of different I/O requests. CONSTITUTION:One disk device 15 is divided into plural logical devices 30, and each logical device 30 consists of logical tracks 33 and logical cylinders 34, and one disk device 15 includes several disk devices of various formats when viewed from an operating system. Therefore, a controller 13 executes the processing of an I/O request even during the seek and search operation of the disk device 15 if this I/O request to the area to which another logical device is assigned is issued from a channel 12 and requests the data transfer between the cache of the controller 13 and the channel 12, thus increasing the disk input/output processing speed.
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