Apparatus and method of reducing physical storage systems needed for a volume group to remain active
US6804747B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2001 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Sep 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2069
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method, system, apparatus and computer program product for reducing the number of physical storage systems needed for a volume group to remain active are provided. This is accomplished by creating mirroring sets out of the physical storage systems in the volume group and by setting up a policy that so long as one mirror out of each mirror set is available, the volume group should be allowed to remain active. To activate a volume group (i.e., when the computer system is turned or reset), there have to be at least one full mirror set and at least one mirror out of each remaining mirror set available. These two policies guarantee that there will always be valid metadata in the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.