Method and apparatus for bypassing a cache

Details Method and apparatus for bypassing a cache Method and apparatus for bypassing a cache

G - Physics

06

F

354/246

G06F 13/00 (2006.01) G06F 12/08 (2006.01)

Patent

CA 1187199

ABSTRACT OF THE DISCLOSURE A storage hierarchy has a caching buffer and a backing store; the backing store preferably having disk-type data-storage apparatus. A directory indicates data stored in the caching buffer. Upon a data-storage access, read or write, within a series of such accesses, resulting in a cache miss, all subsequent data storage accesses in the series are made to the backing store to the exclusion of the caching buffer even though the caching buffer has storage space allocated for such a data transfer. Selected limits are placed on the series to the backing store, such as receiving on end of series (end of command chain) indication from a using unit, crossing DASD cylinder boundaries, receiving an out of bounds address or receiving certain device oriented commands.

411849

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