Raid level 5 with free blocks parity cache
US5522032A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | May 5, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/312
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for writing data to a disk array includes a cache memory coupled to the disk array for storing data indicative of locations on the disk array and parity blocks associated with parity groups including the locations. Each of the parity blocks includes an identifier indicative of locations within a particular parity group which are protected by the parity data. Write logic reads the identifier from the parity block, and based thereon, determines whether a disk location is not protected by the parity data. The write logic also writes to the location and updates the parity data and the identifier associated with the parity block to include the location of the data block to indicate that the location is protected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.