Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2006-05-02
2006-05-02
Bragdon, Reginald G. (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S113000, C711S122000, C711S141000
Reexamination Certificate
active
07039765
ABSTRACT:
Techniques for cache memory management using read and write operations. A read or a write operation to a storage system is initiated for data that is held in a host system cache, but is ready to be evicted from the host system cache. In response to the read operation, the data stored in a mass-storage medium of the storage system is copied to the storage system cache memory in preparation for transfer to the host system. However, the read operation is initiated when the data is not presently needed by the host system. In response to the write operation, the data stored in the host system cache is copied to the storage system cache in preparation for transfer to the mass-storage medium. However, the write operation is initiated when the data is already stored in the mass-storage medium. Then, the data is evicted from the host system cache. This results in exclusivity in that the data becomes present in the storage system cache, but is no longer present in the host system cache.
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