Failure of Site A
This section describes how the 3DC network handles the failure of site A and how it restores to the original state before the failure. (Assume that the network topology is A-B-C, HyperMetro is deployed between sites A and B, and remote replication is deployed between sites B and C.)
DR Mechanism
When site A fails, site B automatically takes over services. During the takeover, site B records the differential data between sites A and B. The remote replication relationship with site C is not affected.
Restoration
When site A recovers and the HyperMetro LUNs and configurations are normal, the storage system at site B automatically synchronizes the differential data generated during the fault period to the storage system at site A. The HyperMetro working status becomes normal.
