Synchronization and resynchronization of loosely-coupled copy operations between a primary and a remote secondary DASD volume under concurrent updating
US6842834B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2003 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Mar 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2087
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for assuring consistency between a primary volume and a remote secondary volume wherein a host CPU manages track-to-track transfers using loosely-coupled, storage control unit mediated, data paths. The method includes initial volume synchronization in which concurrent updates to primary tracks are serialized by the copy progression at the secondary volume according to address. The method further includes volume resynchronization in the event of extrinsic error, fault, or the like in which the status of primary tracks updated during a volume suspension interval utilize bit maps to determine status of tracks unmodified during the suspension interval, and updated tracks and timestamps in addition to addresses. The bit maps and timestamps preserve the most recent version copy order of the tracks on the secondary volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.