Highly available fault tolerant relocation of storage with atomicity
US5504857A · kind A · utility
49Cited by
19References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1993 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Mar 4, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1402
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A computer implemented method for robustly copying pages to system managed storage in order to maintain data in a consistent state and in order to provide continuous access availability of the pages to executing applications. The method achieves data consistency by atomically shadow copying application referenced pages and amending directories in a failure independent medium on (1) an access path interrupt as well as on (2) a page update basis. Availability is enhanced by duplexing the pages and directories as part of the atomic shadow copying step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.