Method of managing time-based differential snapshot
US7890716B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2008 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Apr 8, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1451
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Provided is a method of managing differential snapshots in a storage system, the storage system having a disk drive and a disk controller, the differential snapshot management method including the steps of: providing a storage area of the disk drive as a plurality of logical volumes including an operational volume and a differential volume; storing a time of update for each block in the operational volume; and judging, upon reception of a request to write in a block included in the operational volume, whether to copy data of the block in which requested data is to be written in accordance with the received write request to the differential volume, based on the time of update of the block in which requested data is to be written and a time of creation of the differential snapshot. Accordingly, it is possible to manage the differential snapshot without using a bitmap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.