Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2006-03-07
2006-03-07
Truong, Cam-Y (Department: 2162)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000, C707S793000, C707S793000
Reexamination Certificate
active
07010528
ABSTRACT:
The present invention is directed to a method for controlling file access in a multinode, shared storage, data processing system in which a one set of nodes is capable of acting as metadata controllers and a second set of nodes are tuned for running user applications. By providing two kinds of locks operative at the file level of granularity, a mechanism is produced which permits application programs to also run on their set of metadata controller nodes. One of the locks permits read and write access to existing data blocks but precludes operations such as file deletion or file truncation. The other lock is of lower authority and permits metadata controller nodes, which can provide time limited permissions to the application nodes, to withhold locks which authorize access when requests for access are made from application nodes.
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Curran Robert J.
Haskin Roger L.
Schmuck Frank B.
Wang-Knop Kuei-Yu
Cutter, Esq. Lawrence D.
Heslin Rothenberg Farley & & Mesiti P.C.
Jordan, Esq. Kevin M.
Truong Cam-Y
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