Managing storage device rebuild in data storage systems
US9448735B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2013 |
| Grant date | Sep 20, 2016 |
| Priority date | — |
| Expiry date | Mar 23, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1092
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A technique for managing storage device rebuild in a data storage system is disclosed. A RAID group having multiple drives with unique identifiers is provided. A drive in the RAID group that becomes inactive is identified and a timer is activated. A persistent bitmap is maintained, wherein the bitmap includes a plurality of bits and each bit indicates whether a corresponding portion of the identified drive has changed as a result of an I/O request issued while the drive is identified as inactive. If the inactive drive is subsequently identified as active before the timer expires, the timer is stopped and a rebuild procedure initiated, wherein only portions of the identified drive corresponding to bits in the bitmap are rebuilt. The bitmap is cleared and the RAID group is marked as healthy. If the timer expires before the identified drive become active, a full rebuild procedure is initiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.