Method and system for continuous data protection
US8051044B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2008 |
| Grant date | Nov 1, 2011 |
| Priority date | — |
| Expiry date | Jul 16, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1469
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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 amoun…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.