Identifying lost write errors in a raid array
US8595595B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2010 |
| Grant date | Nov 26, 2013 |
| Priority date | — |
| Expiry date | Oct 5, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/1088
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage server stores data in a stripe of a parity group that includes a plurality of data storage devices to store data and a parity storage device to store parity information. The stripe includes a data block from each of the data storage devices and a parity block from the parity storage device. The storage server receives a data access request specifying a data block in the stripe, and a lost write detection module detects an error in the data block. The lost write detection module compares a first storage device signature stored in a metadata field associated with the data block to a second storage device signature stored in a global field of the data storage device containing the data block. If the first storage device signature matches the second storage device signature, the lost write detection module compares a consistency point count stored in the metadata field to a reconstructed consistency point count. If the reconstructed consistency point count is greater than the consistency point count stored in the metadata field, the lost write detection module identifies the error as a lost write error for the data block. Accurately detecting and identifying the location of a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.