Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2007-06-12
2007-06-12
Sough, Hyung (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S141000, C711S130000
Reexamination Certificate
active
10740219
ABSTRACT:
A data storage system wherein a data controlling director examines the contents of the tag to determine whether requested read data exists in a local cache memory having this data controlling director or in some other local memory cache, or in a disk drive coupled to this data controlling director; and if the requested read data does exist in the local cache memory having this data controlling director, or in the disk drive coupled to director; the data controlling director sends a copy to the local cache memory of the read request receiving director; updates its tag to show a shared copy will reside in the requesting director's local cache memory; and also sends a message to the read requesting director indicating the data is available for storage in the local cache memory on said one of the plurality of first director/memory boards having the read request receiving director.
REFERENCES:
patent: 5420983 (1995-05-01), Noya et al.
patent: 6052822 (2000-04-01), Kim et al.
patent: 2002/0004886 (2002-01-01), Hagersten et al.
patent: 2002/0083270 (2002-06-01), Chilton
patent: 2 366 425 (2002-03-01), None
Doan Duc T.
EMC Corporation
Sough Hyung
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