Creating and Starting DR for a DWS Cluster

Creating an Intra-Region Cluster-Level DR Task

You can create a DR task only when the cluster is in the Available or Unbalanced state.

1. Log in to the DWS console.
2. In the navigation pane on the left, choose Cluster > Management > DR Tasks.
3. On the displayed page, click Create.
4. Set the DR task information.
   • Type: Intra-region DR
   • Name: Enter 4 to 64 case-insensitive characters. The name must start with a letter. Only letters, digits, hyphens (-), and underscores (_) are allowed.

   

5. Configure the production cluster.
   • Cluster Name: Select a created production cluster from the drop-down list.
   • AZ: After a production cluster is selected, the system automatically displays its AZ.

6. Configure the DR cluster.
   • AZ: Select the AZ associated with the region where the DR cluster is located. The AZ of the DR cluster can be the same as that of the production cluster. In a 3-AZ cluster, any of the three AZs can be selected for DR.
   • Cluster Name: Upon selecting an AZ for the DR cluster, the system will filter DR clusters that fulfill the logical homogeneity criteria. If no suitable DR clusters appear, you can click Create DR Cluster to create a DR cluster with the same configuration as the production cluster.

7. Configure advanced parameters. If you select Custom, you can set DR Synchronization Period as required. The DR synchronization period controls how often the production cluster sends incremental data to the DR cluster. If you select Default, the DR synchronization period is 30 minutes by default.
8. Click OK.

   The DR status will then change to Creating. Wait until the creation is complete, the DR status will change to Not Started.

Starting a DR Task

You can start a DR task that is in the Not started, Startup failed, or Stopped state.

1. Log in to the DWS console.
2. In the navigation pane on the left, choose Cluster > Management > DR Tasks.
3. Click Start in the Operation column of the target DR task.
4. In the displayed dialog box, click OK.
   • The DR status will change to Starting. The process will take some time. After the task is started, the DR status will change to Running.
   • After you start the DR task, you cannot perform operations such as restoration, scale-out, upgrade, restart, node replacement, node management, and password update, on the production cluster or DR cluster, and backup is also not allowed on the DR cluster. Exercise caution when performing this operation.
   • Billing for the DR cluster begins once it runs normally and DR recovery is in progress.

Viewing DR Information

1. Log in to the DWS console.
2. In the navigation pane on the left, choose Cluster > Management > DR Tasks.
3. In the DR list, click the name of a DR task.

   On the displayed page, view the following information:

   • DR Information: You can view the DR ID, DR name, DR type, DR creation time, DR start time, and DR status.
   • DR Monitoring: You can view real-time DR recovery point objective (RPO) and recovery time objective (RTO) data.
     • Recovery point objective (RPO) indicates the maximum amount of data loss that the system can tolerate.
     • Recovery time objective (RTO) indicates the maximum allowable downtime for the system.
   • Production Cluster Information: You can view the production cluster ID, cluster name, AZ, used storage capacity, cluster DR status, and the time of the latest successful DR task.
   • DR Cluster Information: You can view the DR cluster ID, cluster name, AZ, used storage capacity, cluster DR status, and the time of the latest successful DR task.
   • DR Configurations: You can view and modify the DR synchronization period.
   • DR Records: You can view the historical records of periodic DR synchronization, including the time and data volume of full synchronization, as well as the time and data volume of incremental synchronization, and other related data.
     Figure 1 DR details
     

Updating DR Configurations

Only DR tasks in the Not started or Stopped state can be modified. The new configuration takes effect after DR is restarted.

1. Log in to the DWS console.
2. In the navigation pane on the left, choose Cluster > Management > DR Tasks.
3. In the DR list, click the name of a DR task.
4. In the DR Configurations area, change the DR synchronization period based on the actual data volume.

Scaling out a Cluster in the DR State

1. Log in to the DWS console.
2. In the navigation pane on the left, choose Cluster > Cluster List.
3. In the cluster list, if Task Information of the cluster you want to scale out is DR not started, perform 5 and 7.
4. (Optional) If the Task Information is not DR not started, delete the DR task. For details, see Deleting a DR Task.
5. In the Operation column of the production and DR clusters, click More and choose Scale Node > Scale Out. Add idle nodes and perform scale-out. For details, see Scaling Out a Cluster. After scale-out, the number of DNs in the production cluster must be the same as that in the DR cluster.
6. Create a DR task. For details, see Creating and Starting DR for a DWS Cluster.
7. Start the DR task. For details, see Starting a DR Task.