Raid controller disk write mask
US7543110B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 2005 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Mar 31, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/1066
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A RAID disk array controller implements a write mask to support partial-stripe updates from a host system without expensive RAM to RAM copying and repeated disk accesses to assemble the updated stripe. New data from the host is transferred into a single buffer and a local processor tracks—by setting bits in the write mask—which segments of the target stripe are updated. The disk array is accessed to transfer the target stripe into the same buffer, but the buffer memory write enable is inhibited—responsive to the write mask—during transfer of the segments that were updated by the host. The complete, updated stripe is thus formed in a single buffer for parity calculations and write to the disk array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.