Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network access regulating
Reexamination Certificate
2004-06-18
2010-06-15
Nguyen, Quang N. (Department: 2441)
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network access regulating
C709S203000, C709S214000, C709S224000, C709S226000
Reexamination Certificate
active
07739379
ABSTRACT:
A network file server includes a first set of data processors for receiving requests from clients, and a second set of data processors for accessing read-write file systems. A respective data processor in the second set is assigned to each file system for exclusive management of read and write locks on the file system. Each data processor in the first set can authorize access to file systems directly accessed by more than one data processor in the second set. Processing of a request for access that is authorized is continued by the data processor that is assigned to manage the locks on the file system to be accessed. The exclusivity of lock management eliminates cache coherency problems, and dynamic load balancing can be used to prevent the lock management from becoming a bottleneck to performance. A preferred embodiment includes a cached disk storage subsystem linked to data mover computers. Each data mover has authorization and ownership information for a plurality of file systems, and maintains a local cache of locking information for file systems that the data mover can directly access. The data mover receives a client request, and if access is authorized, checks whether it can directly access the file, and if not, forwards the request to another data mover.
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Gupta Uday
Porat Betti
Tzelnic Percy
Vahalia Uresh K.
D'Angelo Joseph
EMC Corporation
Gupta Krishnendu
Nguyen Quang N.
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