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Sequential Staging Control Disclosure Number: IPCOM000047940D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08

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Benhase, MT Duke, AH [+details]


A cached storage hierarchy has a control for limiting sequential data in the cache portion. Normally, record N plus the next record (N + 1) is kept in the cache. The record N - 1, the record referred to just prior to record N, is destaged from the cache. In the event record N - 1 or other previously sequentially processed records are referred to, that record is staged as a non-sequential record subject to normal replacement control. If the record N + 1 is replaced, even though sequential, it will not be staged again before a reference to it from a user. A host is attached to the storage hierarchy through a cache. The cache has a usual directory for locating data. The storage hierarchy is completed by a backing store, such as a main memory, direct-access storage device (DASD), tape recorder, and the like.