Coordinated dirty block tracking
US7606841B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 2006 |
| Grant date | Oct 20, 2009 |
| Priority date | — |
| Expiry date | May 21, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99955
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method, system, computer system, and computer-readable medium to maintain consistent, up-to-date copies of primary data that enable quick resumption of operations upon failure of the primary node, the secondary node, and/or the network connecting nodes. The current status of individual storage locations is tracked, indicating whether data in each individual storage location is synchronized between a primary node and a secondary node. Transaction logging by a transaction-logging application, such as a file system or database system, is used to track individual storage locations updated with each transaction. Acknowledgements of these updates are tracked during replication to determine whether individual storage locations containing primary and secondary data are synchronized. This coordinated transaction logging and acknowledgement tracking enables write operations and replication to be performed efficiently while maintaining the information necessary to resynchronize only individual storage locations when primary and- secondary data become unsynchronized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.