Management of point-in-time copy relationship for extent space efficient volumes
US9858180B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2015 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Apr 24, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/70
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage controller receives a request to establish a point-in-time copy operation by placing a space efficient source volume in a point-in-time copy relationship with a space efficient target volume, wherein subsequent to being established the point-in-time copy operation is configurable to consistently copy the space efficient source volume to the space efficient target volume at a point in time. A determination is made as to whether any track of an extent is staging into a cache from the space efficient target volume or destaging from the cache to the space efficient target volume. In response to a determination that at least one track of the extent is staging into the cache from the space efficient target volume or destaging from the cache to the space efficient target volume, release of the extent from the space efficient target volume is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.