I/O Storage controller cache system with prefetch determined by requested record's position within data block
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United States of America Patent
Stats
-
Dec 25, 1984
Grant Date -
N/A
app pub date -
Jun 5, 1981
filing date -
Jun 5, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a data processing system of the type wherein a host processor transfers data to or from a plurality of attachment devices, a cache memory is provided for storing blocks of data which are most likely to be needed by the host processor in the near future. The host processor can then merely retrieve the necessary information from the cache memory without the necessity of accessing the attachment devices. When transferring data to cache from an attachment disk, additional unrequested information can be transferred at the same time if it is likely that this additional data will soon be requested. Further, a directory table is maintained wherein all data in cache is listed at a 'home' position and, if more than one block of data in cache have the same home position, a conflict chain is set-up so that checking the contents of the cache can be done simply and quickly.
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