Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2008-01-11
2011-10-25
Dudek, Jr., Edward J (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S135000, C711SE12103, C707S655000
Reexamination Certificate
active
08046548
ABSTRACT:
Techniques for maintaining mirrored storage cluster data consistency can employ write-intent logging. The techniques can be scaled to any number of mirror nodes. The techniques can keep track of any outstanding I/Os, data in caches, and data that has gone out of sync between mirrored nodes due to link failures. The techniques can ensure that a power failure on any of the storage nodes does not result in inconsistent data among the storage nodes. The techniques may keep track of outstanding I/Os using a minimal memory foot-print and having a negligible impact on the I/O performance. Properly choosing the granularity of the system for tracking outstanding I/Os can result in a minimal amount of data requiring transfer to synchronize the mirror nodes. The capability to vary the granularity based on physical and logical parameters of the storage volumes may provide performance benefits.
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Balakrishnan Narayanan
Chatterjee Paresh
Jayaraman Raja
Narayanan Ajit
American Megatrends Inc.
Dudek, Jr. Edward J
McKeon Meunier Carlin & Curfman LLC
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