Method and system for continuous data protection

Details Method and system for continuous data protection Method and system for continuous data protection

2008-04-01

2011-11-01

Vo, Tim T (Department: 2168)

Data processing: database and file management or data structures

File or database maintenance

Database backup

C707S625000, C707S648000, C707S654000, C707S682000

Reexamination Certificate

active

08051044

ABSTRACT:
Continuous data protection is performed as two parallel processes: copying a data block from the storage device into the backup storage device (creating initial backup) and copying the data block to be written to the data storage into the incremental backup. When a write command is directed to a data storage block, it's intercepted and redirected to the backup storage, and data, which is to be written in accord to the write request, is written to the incremental backup on the backup storage. If write command is also directed to a data storage block identified for backup that has not yet been backed up, the identified data storage block is copied from the storage device to the intermediate storage device, the write command is executed on the identified data storage block from the storage device, and the data storage block is copied from the intermediate storage device to the backup storage device. In case of an error accessing a block on the storage device, the block is marked as invalid. The system suspends a write command to the storage device during the initial data backup process if the intermediate storage device has reached a selected data capacity; and copies a selected amount of data from the intermediate storage device to the backup storage device.

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