Copy-redirect on write
US10209910B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2018 |
| Grant date | Feb 19, 2019 |
| Priority date | — |
| Expiry date | Jan 29, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0689
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system, method, and computer program product for managing storage volumes in a point-in-time copy cascade. A processor swaps a host portion of a source volume with a host portion of a snapshot point-in-time copy volume. Responsive to an I/O request to overwrite a first data value in a grain of the source volume with a second data value, a processor writes the second data value in a corresponding grain of the snapshot point-in-time copy volume. Responsive to a corresponding grain of a clone point-in-time copy volume not comprising the first data value, a processor copies the first data value to the corresponding grain of the clone point-in-time copy volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.