Point-in-time copy with target write optimization
US10698631B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2018 |
| Grant date | Jun 30, 2020 |
| Priority date | — |
| Expiry date | Sep 22, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method, computer system, and a computer program product for point-in-time copy with target write optimization in a cascading copy-on-write process is provided. The present invention may include receiving a request to perform a point-in-time copy operation to create a point-in-time copy from a source volume to a target volume. The present invention may include creating an intermediate volume, an intermediate map, and a map for the target volume. The present invention may include making the intermediate volume dependent on the source volume in a dependency chain based on the intermediate map. The present invention may include making the target volume dependent on the intermediate. The present invention may include allocating a new stream identifier to the target volume. The present invention may also include updating upstream volumes to inherit the new stream identifier as well as maintaining any existing stream identifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.