Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Patent
1997-05-29
1999-08-24
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
39518217, G06F 1216
Patent
active
059436883
ABSTRACT:
A data storage system provides a method and apparatus for preserving consistency between a database back-up and a set of storage volumes. The system includes a storage manager, or storage controller, interconnected to a plurality of storage volumes, a drive, and a database storage. The storage manager receives data files from an attached data processing unit. The storage manager directs the data files such that the files are written to a selected storage volume loaded into the drive. The storage manager maintains reference information and storage volume location information for each data file in the database storage. The storage manager detects a volume full condition when the storage media approaches a predetermined position prior to the physical end of the volume. The storage manager generates a back-up copy of the current database, transfers the database back-up to the drive, and directs the drive to write the database back-up onto the selected storage volume. Thus, each selected storage volume contains a database back-up which remains consistent with the data files currently stored on the selected storage volume and previously stored on previously selected storage volumes.
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Fisher James Arthur
Kishi Gregory Tad
Peake Jonathan Wayne
Chan Eddie P.
Ellis Kevin L.
International Business Machines - Corporation
Sullivan Robert M.
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