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Failure of Site A
This section describes how the DR Star trio handles the failure of site A and how it restores to the original state before the failure.
DR Mechanism
- Site B continues to provide services without any impact on the services.
- Switch over the active and standby asynchronous remote replication relationships.
- When the Switchover Policy is Automatic, the system automatically performs the switchover.
- When the Switchover Policy is Manual, select Manually Switch Over.
After the switchover, asynchronous remote replication between sites A and C changes to the standby state, and that between sites B and C changes to the active state.
- Perform incremental data synchronization between sites B and C.
Restoration
- After site A recovers, the HyperMetro relationship between sites A and B is restored. The Recovery Policy of HyperMetro takes effect. If the Recovery Policy is Automatic, incremental data synchronization is automatically performed between sites A and B. If the Recovery Policy is Manual, click Synchronize manually. In this case, the relationships among the sites of the DR Star trio are as follows: HyperMetro between sites A and B, active asynchronous remote replication between sites B and C, and standby asynchronous remote replication between sites A and C.
- Optional: Determine whether to set site A as the preferred site of HyperMetro. If this is required, click Preferred Site Switchover on the HyperMetro management page.
- (Optional) Determine whether to set the asynchronous remote replication relationship between sites A and C to the active state. If this is required, choose More > Manually Switch Over on the DR Star Trios page.
