Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2005-05-17
2005-05-17
Metjahic, Safet (Department: 2161)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000, C711S141000, C711S162000
Reexamination Certificate
active
06895416
ABSTRACT:
The present in invention is directed to a checkpointing filesystem of a distributed-memory parallel supercomputer comprising a node that accesses user data on the filesystem, the filesystem comprising an interface that is associated with a disk for storing the user data. The checkpointing filesystem provides for taking and checkpoint of the filesystem and rolling back to a previously taken checkpoint, as well as for writing user data to and deleting user data from the checkpointing filesystem. The checkpointing filesystem provides a recently written file allocation table (WFAT) for maintaining information regarding the user data written since a previously taken checkpoint and a recently deleted file allocation table (DFAT) for maintaining information regarding user data deleted from since the previously taken checkpoint, both of which are utilized by the checkpointing filesystem to take a checkpoint of the filesystem and rollback the filesystem to a previously taken checkpoint, as well as to write and delete user data from the checkpointing filesystem.
REFERENCES:
patent: 5551043 (1996-08-01), Crump et al.
patent: 5864849 (1999-01-01), Bohannon et al.
patent: 6173292 (2001-01-01), Barber et al.
patent: 6385625 (2002-05-01), Slaughter
Gara Alan G.
Giampapa Mark E.
Steinmacher-Burow Burkhard D.
Alaubaidi Haythim
Metjahic Safet
Morris, Esq. Daniel P.
Scully Scott Murphy & Presser
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