Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2005-03-01
2005-03-01
Sparks, Donald (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S114000, C711S141000, C711S152000, C711S161000, C711S162000, C711S163000, C710S002000, C710S200000, C709S208000, C709S209000, C709S210000, C709S211000, C707S793000, C707S793000, C707S793000, C707S793000, C707S793000
Reexamination Certificate
active
06862668
ABSTRACT:
The present invention provides a method and apparatus for using cache coherency locking to facilitate on-line volume expansion in a multi-controller storage device. A volume set is divided into segments by a first controller. The first controller acquires a cache lock for one of the segments of the volume set to be expanded. A second controller is provided access to any non-cache-locked segments of data during the expansion while safeguarding integrity of the segment undergoing expansion. The first controller also provides the second controller information regarding the expansion so that the second controller may, in the event the first controller fails, perform the expansion using a backup copy of the segment being expanded.
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McKean Brian Dennis
Pare Randall Alan
International Business Machines - Corporation
Sparks Donald
Truong Baq Q
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