Method for writing specific values last into data storage groups containing redundancy
US5396620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0804
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention comprises a method for enhancing data integrity during write operations in a data storage subsystem which comprises an array of redundant, interconnected disk drives. A data storage subsystem is disclosed which provides for writing data segments spread across N disk drives of the array and provides for generating and recording redundancy information spread across M disk drives. Redundancy information is used for reconstructing erroneous data in the case of a disk drive failure. It may be desirable to write a final portion of the data last, after other portions of the data and associated redundancy information have been recorded to the disk drives. The last portion of the data segments may contain information that validates the data. It is common to automatically generate the redundancy information as the data is written to the disk drives. The generated redundancy information is then later written to the disk drives. This presents a problem in that the last portion of the data is written to disks before correct redundancy information is written. The present invention discloses a method of writing data and associated redundancy information to eliminate this pro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.