Method and system for incremental time zero backup copying of data
US5263154A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1992 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Apr 20, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1466
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Backup copying of designated datasets representing a first selected point in time consistency may be performed in a data processing system on an attached storage subsystem concurrent with data processing system application execution by first suspending application execution only long enough to form a logical-to-physical address concordance, and thereafter physically backing up the datasets on the storage subsystem on a scheduled or opportunistic basis. An indication of each update to a selected portion of the designated datasets which occurs after the first selected point in time is stored and application initiated updates to uncopied designated datasets are first buffered. Thereafter, sidefiles are made of the affected datasets, or portions thereof, the updates are then written through to the storage subsystem, and the sidefiles written to an alternate storage location in backup copy order, as controlled by the address concordance. At a subsequent point in time only those portions of the designated datasets which have been updated after the first selected period and time are copied, utilizing an identical technique.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.