System and method for updating a copy-on-write snapshot based on a dirty region log
US7395378B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2005 |
| Grant date | Jul 1, 2008 |
| Priority date | — |
| Expiry date | Jul 23, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Various methods and systems for updating a copy-on-write snapshot based on a dirty region log are disclosed. For example, a method involves maintaining a dirty region log and updating a copy-on-write snapshot change tracking map, based on information in the dirty region log. In some embodiments, the copy-on-write snapshot change tracking map is updated in response to an indication of a dirty region log cleaning cycle. The dirty region log cleaning cycle is inhibited until after the copy-on-write snapshot change tracking map has been updated. The method can be used to update multiple copy-on-write snapshot change tracking maps, each of which is associated with a respective one of several copy-on-write snapshots, based on information in the dirty region log. Such a method can be performed by a virtualizing network device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.