Integrity protection for parity calculation for raid parity cache
US5640506A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 1995 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Feb 15, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/1009
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improvement on the use of parity and a write cache for a RAID by adding a check code for the parity data itself. In addition, the time during which the parity check code is unprotected is reduced by using a single loop to calculate the old parity check code and verify it, determine the new parity information itself from the new write data, and calculate the new parity check code. Rather than cycle through all the parity blocks to calculate the old check code, and verify that it matches what is stored, the old check code is reconstructed block-by-block as the new parity is generated for each block in a loop. In addition, the new parity check code is constructed bit-by-bit at the same time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.