System and method for satisfying I/O requests before a replica has been fully synchronized
US7685385B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2005 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Jul 1, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2094
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Various methods and systems are disclosed for handling I/O requests to a replica that has not yet been fully synchronized. One method involves detecting the transfer of the role of working volume from a first volume to a second volume. The second volume is configured as a replica of the first volume, but the second volume may not be fully synchronized with the first volume at the time that the role of working volume is transferred. Subsequent to the role of working volume being transferred to the second volume, a read request to the second volume is satisfied by accessing a log. The log is configured to store values that have been written to the first volume, and at least one of the values written to the first volume has not been written to the second volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.