Computer system storage device and date updating method
US8015219B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2008 |
| Grant date | Sep 6, 2011 |
| Priority date | — |
| Expiry date | Oct 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Data stored in a plurality of snapshots that can be updated is efficiently updated.A computer system includes a computer that provides a plurality of storage areas and a storage device that stores data read and written in the storage areas. The storage device provides a first volume that stores data shared by the storage areas respectively and a second volume that stores data held in the storage areas respectively. The computer stores storage area management information and a storing flag that shows a storing part of updated data and sets the storing flag in accordance with a request. When the computer receives the update of the data stored in the first volume and the storing flag is set to the second volume, if a second area corresponding to a first area is not allocated to the second volume, the computer updates a second area newly allocated to the second volume to store the location information of the newly allocated second area in the storage area management information correspondingly to the first area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.