Method and system of buffering data written to direct access storage devices in data processing systems
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United States of America Patent
Stats
-
Dec 2, 1997
Grant Date -
N/A
app pub date -
Jan 23, 1995
filing date -
Sep 23, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention teaches a system and method for temporarily buffering data written to a storage system by a host computer. The storage system includes direct access storage devices and a cache. The cache is used as the buffer for both caching and noncaching data records before destaging to a direct access storage device. Upon receipt of a channel program from a host computer containing data for records to be updated, the storage controller determines if the records are currently cached. If the records are not cached, a write miss has occurred. Upon a write miss the storage controller checks an attribute transmitted in the channel program to determine if the records have a regular format. Records having a known, regular format are buffered in cache until destaged by a background process.
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