Common hot spare for multiple RAID groups
US8943359B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2012 |
| Grant date | Jan 27, 2015 |
| Priority date | — |
| Expiry date | Mar 7, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2094
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage system assigns one or more large disks in a storage enclosure as a common dedicated hot spare that is used by multiple RAID groups. Storage space equivalent to the smallest physical disk in a RAID group is allocated on the common dedicated hot spare. A mapping of this allocated storage space to the RAID group is maintained in nonvolatile memory. When a disk fails in the RAID group, the allocated storage space on the common dedicated hot spare receives a rebuild of the failed disk. Once the rebuild is complete, the allocated storage space acts as part of the RAID group. When the failed disk is replaced, the data on the allocated storage space is copied to the replacement disk. Once the copy is complete, the allocated storage space is once again set to act as a dedicated hot spare to the RAID group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.