Disk array system having special parity groups for data blocks with high update activity
US5490248A · kind A · utility
82Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1994 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Dec 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/1095
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a digital storage disk array system in which parity blocks are created and stored in order to be able to recover lost data blocks in the event of failure of a disk, high-activity parity groups are created for data blocks having high write activity and low-activity parity groups are created for data blocks not having high write activity. High-activity parity blocks formed from the high-activity data blocks are then stored in a buffer memory of a controller rather than on the disks in order to reduce the number of disk accesses during updating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.