Performing Fault Recovery

Prerequisites

• You have logged in to the DR management system at the DR site.
• The management system and the DR environment at the DR site are working properly.
• At least one recovery plan has been created in the system.
• Storage devices, hosts, or VMs at the site where a protected group resides have been refreshed, if storage devices, hosts, or VMs at the production site or DR site change. For details, see Refreshing Resource Information.

Context

If the recovery plan is based on the snapshot or clone protection policy template, fault recovery cannot be performed.

In DR DC solutions (geo-redundant mode), if the production center becomes unavailable due to disasters, recover data and run services at the same-city DR center; if the production center and the same-city DR center become unavailable due to disasters, recover data at and run services at the remote DR center.

If the VM where the production site resides is configured with an IP address but without any network adapter, after the fault recovery, the IP address of the VM where the DR site resides is:

• Windows
• Dynamically obtained when VM specifications already configured.
• Consistent with that of the VM where the production site resides when VM specifications not configured.
• Linux

  Dynamically obtained.

Procedure

1. On the menu bar, select Utilization > Data Restore.
2. Select the remote recovery plan for which you want to perform fault recovery and click More > Fault Recovery on the Operation list.
3. Perform fault recovery based on the protected object type.
   

   If Huawei multipathing software has been installed on the Linux DR host, ensure the configured I/O suspension time is not 0 and all virtual devices generated by the software have corresponding physical devices. For details, see the OceanStor UltraPath for Linux xxx User Guide.

   • If the protected object type is type LUN, perform the following:
     1. Select DR Site.
     2. Select Host (Group) > Available DR Hosts or Host Groups (This operation is optional when the protected object type is LUN).
        

        • If T series V2 or a later version is deployed at the DR site, the DR host whose services you want to recover can belong to only one host group that belongs to only one mapping view. The secondary LUN of the remote replication pair that corresponds to the storage LUN used by the protected applications can belong to only one LUN group, and the LUN group must belong to the same mapping view as the host group. If T series V200R001C00 is deployed, after creating mapping view, you cannot select the Enable Inband Command to modify the properties of the mapping view.
        • If the storage is T series V2R2 or a later version or 18000 series, the storage support automatic host adding and storage mapping. If the connection between the storage device and the host initiator is normal, the hosts, host groups, LUN mappings, and mapping views will be created in the storage device automatically. The creation principles are as follows:

          

        • If no DR host or DR host group is selected, you need to manually map DR LUNs to the DR host when the type of protected objects is LUN.
     3. Click Fault Recovery.
     4. In the Warning dialog box that is displayed, read the content of the dialog box carefully and select I have read and understood the consequences associated with performing this operation.
     5. Click OK.
   • If the recovery plan is based on the HyperVault or snapshot protection policy template, select Test Host and then select the tested copy, and click Test.
   

   In the Protected Object area, click View. In the Associate protected objects dialog box that is displayed, you can view information about copies and change information about the objects under protection.

Result

After a fault recovery starts, you can view the execution process and result. If the fault recovery fails, you can resolve the problem and try again.

Follow-up Procedure

After the fault recovery, services are running at the DR site. If the original production site reconstructs in non-site level (such as power supply recovery after a power outage) and the service switchback is required, perform the following:

1. Executing Reprotection.

   Before switching back services, performing reprotection can protect running data at the DR site and automatically recover the service data generated at the DR site to the original protection site based on the specified policy.

2. Testing a Recovery Plan.

   After reprotection, the service data at the DR site is recovered to the production site. Before service failback, you need to perform a DR test to ensure data usability.

3. Clearing Test Data.

   This operation will automatically clear the test data generated during the DR test to ensure the successful rate of service failback.

4. Performing Fault Recovery.

   This operation will automatically migrate services back to the original production site.

5. Executing Reprotection.

   To ensure that services can be recovered at the DR site during failback, reprotection needs to be performed again.