Rapid recovery from downtime of mirrored storage device
US10380021B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2013 |
| Grant date | Aug 13, 2019 |
| Priority date | — |
| Expiry date | Aug 18, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/286
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
No-loss rapid recovery performs resynchronization efficiently while concurrently allowing availability to mirrored data on the storage device. No-loss rapid recovery has two stages and involves storage devices that have both a non-volatile cache and primary storage and that operate as mirror buddies. The first stage is referred to herein as the buddy-retention stage. During the buddy-retention stage, writes to mirrored data are not performed on the offline mirror buddy but are performed on the online mirror buddy. The mirrored data changed in the online mirrored buddy is retained in the non-volatile cache of the retention buddy. The next stage is referred to herein as the rapid resynchronization stage. In this stage, the changed mirrored data retained by the retention buddy for no-loss rapid recovery is used to resynchronize the offline buddy. The storage device is resynchronized using the changed mirrored data retained in the cache of the mirror buddy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.