Incremental disk backup

Details Incremental disk backup Incremental disk backup

1996-03-22

1998-04-07

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711112, G06F 1216

Patent

active

057377634

ABSTRACT:
Each node of a distributed (multi-node) data processing system, which includes a plurality of shared data storage disks, has a respective incremental backup bit-file containing one bit for each datablock of the shared disks. The bits are initially set to logical 0. When a node writes data to a datablock the respective bit is reset to logical 1. Upon an incremental backup requirement, one node reads all of the bit-files, forms the logical OR thereof and forms a respective new bit-file. The blocks whose bits equal 1 in this new bit-file are then backed up. The bit-files are stored in the node main memories for quick access and will be lost upon node failure. However if a redo log is maintained, bit-files can be reconstructed.

REFERENCES:
patent: 4686620 (1987-08-01), Ng
patent: 5089958 (1992-02-01), Horton et al.
patent: 5133065 (1992-07-01), Cheffetz et al.
patent: 5263154 (1993-11-01), Eastridge et al.
patent: 5559991 (1996-09-01), Kanfi

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