Storage system and storage control method
US7181477B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2004 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Jul 16, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99954
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A primary volume group 30 includes a primary volume 31 and a differential volume 32. A secondary volume group 40 includes a primary volume 41 and a differential volume 42. Multiple generations of differential snapshots D1 to D3 are accumulated in the differential volume 32. When a new snapshot obtaining request is issued while a usage rate has reached a given value, the volume groups 30 and 40 are synchronized with the volume snapshot (a), and then split (b). After being split, the differential volume 32 is initialized, and the secondary volume group 40 is backed up (c). Accordingly, a new differential snapshot can be created and held in the differential volume 32.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.