Low traffic failback remote copy
US8250031B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2008 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Mar 23, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The local storage performs remote copy to the remote storage. For low traffic failback remote copy, the remote storage performs a delta copy to the local storage, the delta being the difference between the remote storage and local storage. The local storage backs up snapshot data. The remote storage resolves the difference of the snapshot of the local storage and the remote storage. The difference resolution method can take one of several approaches. First, the system informs the timing of snapshot of the local storage to the remote storage and records the accessed area of the data. Second, the system informs the timing of snapshot of the local storage to the remote storage, and the remote storage makes a snapshot and compares the snapshot and remote copied data. Third, the system compares the local data and remote copy data with hashed data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.