Managing prior versions of data for logical addresses in a storage device
US9671971B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2015 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Apr 26, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/7205
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Provided are a method, system, and computer readable storage medium for managing access to a storage device. A logical-to-physical mapping indicates for each logical address a physical address in the storage device having current data for the logical address and version information indicating whether there is a prior version of data for the logical address. In response to the logical-to-physical mapping indicating that there is no prior version of the data for a target logical address of a write, including information on the target physical address and the physical address indicated in the logical-to-physical mapping in checkpoint information. The version information for the target logical address is updated to indicate that there is a prior version of data. Data for the write is written to a target physical address. The logical-to-physical mapping for the target logical address is updated to indicate the target physical address.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.