Rebuilding process for storage array
US9910748B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 31, 2015 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | Apr 17, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/1041
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
When a drive in a redundant array of independent disks (RAID) fails, for a first stripe unit stored in the failed drive, a RAID controller obtains from a bitmap a first indicator indicating whether the first stripe unit contains written data, wherein the bitmap contains a plurality of indicators corresponding to stripe units stored in the failed drive, and the first stripe unit belongs to a first stripe stored in the RAID system; if the first indicator indicates that the first stripe unit does not contain written data, write zeros into a first replacement stripe unit in a replacement drive, wherein the first replacement stripe unit replaces the first stripe unit in the first stripe. Without performing XOR operations for the stripe units indicated no data by the table, a time consumed for rebuilding can be significantly reduced, recovering the RAID array healthy sooner and reducing the impact on system bandwidth usage and host I/O performance impact during the rebuild process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.