Promoting device level error to raidset level error to restore redundacy in a raid array data storage system
US5933592A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1995 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Oct 13, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1833
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A RAID array includes redundant storage devices. Data is distributed across the storage devices, and organized as slivers of RAID protected data blocks. This redundancy provides for the reconstruction of valid data when data at a particular data block of a sliver is found to be inconsistent. However, when more than one data block of a sliver is found to have inconsistent data, reconstruction of the inconsistent data blocks may not be possible. Nonetheless, data consistency can still be restored to that sliver. Consistency is restored to such a sliver by replacing any inconsistent data in a data block with predetermined data and reconstructing the parity data block using the predetermined data. Other data in the RAID array keeps track of those data blocks with the predetermined data to indicate that such blocks do not contain valid data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.