Restoring a mass storage device to a prior state in response...

G - Physics – 06 – F

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G06F 11/16 (2006.01) G06F 3/06 (2006.01) G06F 12/00 (2006.01) G06F 12/16 (2006.01)

Patent

CA 2432794

Restoring a mass storage device 12, including the corresponding data blocks 20 stored thereon, to a state in which it existed at a prior instant in time to minimize the data loss caused by data blocks 20 becoming corrupt or lost. After a mirrored or backup copy has been made, data blocks 40 that are to be overwritten in response to a write request are stored in a preservation memory 14 prior to being overwritten. The data blocks 40 stored in the preservation memory 14 are time-stamped to designate the chronological order by which the data blocks 40 were overwritten. If data becomes corrupted, the data blocks 40 of the presentation memory 14 are applied to the corrupted data 20 in reverse chronological order until such time that a valid, non-corrupted set of data obtained. In this manner, data more recent than that associated with the full mirrored or backup copy can be reconstructed.

L'invention porte sur la reconstitution à un état antérieur d'une mémoire de grande capacité (12) et des blocs de données correspondants y étant stockés, de manière à réduire les pertes de données dues à l'altération ou à la perte de blocs de données. Après réalisation d'une copie miroir ou de sauvegarde, les blocs de données (40) devant être écrasés en réponse à une demande d'écriture sont stockés avant l'écrasement dans une mémoire de préservation (14) ou ils sont horodatés de manière à indiquer leur (40) ordre chronologique d'écrasement. Si des données ont été altérées, les blocs de données de la mémoire de préservation (14) sont appliquées sur les données altérées jusqu'à obtention d'un ensemble valable de données non altérées. On peut ainsi reconstituer les données plus récentes que celles associées aux copies miroirs ou aux sauvegardes d'ensemble.

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