Device and method for input/output control of a computer system for efficient prefetching of data based on lists of data read requests for different computers and time between access requests
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 10, 2002
Grant Date -
Jan 3, 2002
app pub date -
Dec 23, 1998
filing date -
Mar 27, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus including an input/output control device and an associated method are disclosed. The method includes a list with read requests recorded therein in the order of generation thereof is provided for each client, and a read request from a client is added to an end of a list for the client, when the request is generated within a specified period of time after generation of the previous read request from the same client. When the request is generated after passage of the specified period of time, it is added to a header of a new list. Common sections of the two lists are recorded in a common table, and information instructing to refer to the common table is inserted into the lists in place of the common sections in the lists. Data is prefetched from the disk device and stored in a cache memory based on the content of the lists. Data corresponding to common sections between the two lists may be relocated or written in a continuous empty area of the disk device in a continuous state.
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