Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2008-06-23
2011-11-01
Bragdon, Reginald (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S162000, C711S112000, C711SE12002, C711SE12003
Reexamination Certificate
active
08051259
ABSTRACT:
Illustrative embodiments provide a computer implemented method for incremental storage de-allocation during a clean process within a point-in-time copy storage management system. The computer implemented method determines whether to perform the clean process and responsive to a determination to perform the clean process, determines whether a set of discrepant bits is present. Responsive to the determination that the set of discrepant bits is present, the computer implemented method copies each dirty grain for each discrepant bit in the set of discrepant bits to a downstream target to form a set of copied dirty grains and determines whether a particular dirty grain in the set of copied dirty grains has been allocated to a space efficient storage unit. Responsive to a determination that the particular dirty grain was allocated to a space efficient storage unit, the computer implemented method de-allocates the particular grain from an upstream source.
REFERENCES:
patent: 6799258 (2004-09-01), Linde
patent: 7676641 (2010-03-01), Agombar et al.
patent: 2006/0064416 (2006-03-01), Sim-Tang
patent: 2006/0143407 (2006-06-01), Humlicek
patent: 2006/0143413 (2006-06-01), Agombar et al.
patent: 2006/0206603 (2006-09-01), Rajan et al.
patent: 2007/0239938 (2007-10-01), Pong
Agombar John Paul
Beeken Christopher Barry Edgar
Bluestone Randall
Bragdon Reginald
International Business Machines - Corporation
Ruiz Aracelis
Yee & Associates P.C.
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