Method, apparatus and program for migrating between striped storage and parity striped storage
US7206991B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2003 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Jun 6, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1096
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A mechanism is provided for migration between stripe storage and redundant parity striped storage. When a disk is added to a disk array, the mechanism migrates from RAID 0 to RAID 5. For each row, the mechanism calculates parity for the row and, if the parity position is not the new drive, the mechanism writes the data from the parity position to the new drive and writes the parity to the parity stripe position. If a drive fails, the mechanism migrates back from RAID 5 to RAID 0. For each row, if the parity position is not the failed drive, reads the data from remaining drives, XORs the data stripes to get failed drive data, and writes the failed drive data to the parity position. If a read or write is received for the failed drive, the mechanism simply redirects the read or write to the parity position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.