File system group consistency point
US7752180B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2006 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Jul 23, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A network storage filer implements a four-phase commit protocol to coordinate consistency points among a group of volumes (a “group consistency point”) such that, upon recovery, all volumes of the group reflect consistency points taken at the same time. The filer records progress at each phase while creating the consistency points of the volumes. Upon recovery, the same or a different filer uses the last recorded progress indicator to ascertain whether the consistency points were completed on all of the volumes in the group. If all the volume consistency points of the group consistency point were completed, the filer users the volume consistency points to mount the volumes. Otherwise, the filer uses an earlier group consistency point to mount the volumes. In either ease, the volumes are consistent with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.