Patent ID: 6427184
Filing Date: 2002-07-30
Classification: G06F

Abstract:
A magnetic disk processing device, comprising:an input/output stream monitor table for storing an information of input/output streams; input/output stream monitor means for searching and updating said input/output stream monitor table when an input/output stream from a host computer arrives at said input/output monitor means and determining, on a basis of whether or not a start address of a certain input/output stream coincides with an incremented value of a last address of a past input/output stream stored in said input/output stream monitor table, whether or not the input/output stream is a sequential input/output stream to be read from or written into a magnetic disk; and prefetch activator means for calculating a start address of prefetch on the basis of the stream start address and the prefetch size when said input/output stream monitor means detects a sequential read by hitting an entry by an input/output stream of a certain read type and a difference between the prefetch size and the input/output stream size becomes smaller than a preset threshold value as a result of an operation of said input/output stream monitor table, newly activating the prefetch of a preset size and updating the prefetch size.