What Can I Do When the FusionSphere, VRG, and UltraVR in the Production End Encounter an Irrecoverable Fault?

Symptom

In a DR scenario where the host-based replication DR technology is used, the FusionSphere, VRG, and UltraVR in the production end encounter an irrecoverable fault.

Possible Causes

The FusionSphere, VRG, and UltraVR in the production end are both faulty.

Procedure

Rectify the fault on UltraVR in the production end. For details, see Executing Fault Recovery.
On FusionCompute in the DR end, ensure Type of the corresponding VM is changed from Placeholder VM to Common VM. If Type of the VM remains to be Placeholder VM, contact Huawei technical support.
Reconstruct FusionSphere, VRG, and UltraVR in the production end.
Delete UltraVR existing on FusionCompute in the DR end and install it again. For details, see Installation and Uninstallation.
After UltraVR is reinstalled successfully in the DR end, initialize the VRG.
1. In FusionCompute, select VM and Template.
  Go to the VM and Template page.
2. In the line of the created VRG VM, click Log in using VNC.
3. Log in to the VRG VM as user gandalf.
  Default password: See the default password of the account for the target node on the Type B (UltraVR) sheet in the UltraVR V100R003C10SPC900 Account List.
4. Run the following command and enter the password of user root as prompted to switch to user root.
  su - root
  
  Default password: See the default password of the account for the target node on the Type A (Background) sheet in the UltraVR V100R003C10SPC900 Account List.
5. Run the following command to go to the path of the network configuration tool.
  cd /opt/galax/vrg/webserver/VrgTools
6. Run the following command to start the network configuration tool.
  python2.7 vrgtools.py
  
  The following command output is displayed:
```
 
Function list: 
 0. exit. 
 1. change password for UltraVR-rest. 
 2. initialization vrg_conf.xml. 
 3. changing password for Vrg_trap. 
 4. initial VRG net information. 
 5. modify net information. 
 6. change password for vrg authentication. 
 7. disable or enable TLS1.0 protocol.
```
7. Enter 2 and press Enter.
8. Enter the user name and password of the account for authenticating the VRG northbound RESTful APIs as prompted.
  
  The user name is admin and the default password is Huawei@CLOUD8!.
9. Enter yes and press Enter.
  The VRG is successfully initialized if the following command output is displayed:
```
Initialization vrg_conf.xml success.
```
10. Enter 0 and press Enter to exit the configuration wizard.
11. Run the following command to restart the VRG service.
  service dpvrg restart
On UltraVR in the production and DR ends, recreate local sites. For details, see Creating a Site.
On UltraVR in the production and DR ends, add the FusionSphere components to the created local sites, including FusionCompute, FusionManager, and VRG.
- For details about how to add FusionCompute, see Adding FusionManager.
- For details about how to add FusionManager, see Adding FusionCompute.
- For details about how to add the VRG, see Adding a VRG.
Add remote management servers to UltraVR in the production and DR ends, respectively. For details, see Detecting the Remote Management Server (in Remote DR Mode).
On UltraVR in the DR end, create resource mappings. For details, see Create a Resource Mapping.
On UltraVR in the DR end, add a new pair VRGs. For details, see Configuring VRG Pairs.
On UltraVR in the DR end, add the desired VM to the pair VRGs. For details, see Adding VMs.
On UltraVR in the DR end, create a protected group that adopts host-based replication. For details, see 4.2.8 .
On UltraVR in the DR end, manually execute the protected group created in Step 12. The operation is successful. For details, see Executing a Protected Group.
On UltraVR in the DR end, create a recovery plan for the protected group that adopts host-based replication. For details, see Creating a Recovery Plan.
On UltraVR in the DR end, perform planned migration and reprotection to the created recovery plan respectively by referring to Executing Planned Migration and Executing Reprotection.