Editing a DR Task

Prerequisites

You have logged in to the DRS console.

Method 1

1. In the task list on the Disaster Recovery Management page, locate the target task and click Edit in the Operation column.
2. On the Configure Source and Destination Databases page, enter information about the service and DR databases and click Next.
3. On the Check Task page, check the DR task.
   • If any check fails, review the failure cause and rectify the fault. After the fault is rectified, click Check Again.

     For details about how to handle check failures, see Checking Whether the Source Database Is Connected in Data Replication Service User Guide.

     Figure 1 Pre-check
     
   • If the check is complete and the check success rate is 100%, go to the Compare Parameter page.
     

     You can proceed to the next step only when all checks are successful. If there are any items that require confirmation, view and confirm the details first before proceeding to the next step.

4. Compare the parameters.
   The parameter comparison function helps you check the consistency of common parameters and performance parameters between service and DR databases and show inconsistent values. You can determine whether to use this function based on service requirements. It mainly ensures that services are not affected after the DR task is completed.

   • This process is optional, so you can click Next to skip the comparison.
   • Compare common parameters:
     • For common parameters, if the parameters in the service database are different from those in the DR database, click Save Change to make the parameters of the DR database be the same as those in the service database.
       Figure 2 Modifying common parameters
       
     • Performance parameter values in both the service and DR databases can be the same or different.
       • If you need to adjust the performance parameters, enter the value in the Change to column and click Save Change.
       • If you want to make the performance parameter values of the source and destination database be the same:
         1. Click Use Source Database Value.

            DRS automatically makes the DR database values the same as those of the service database.

            Figure 3 One-click modification
            
            

            You can also manually enter the value as required.

         2. Click Save Change.

            DRS changes the DR database parameter values based on your settings. After the modification, the comparison results are automatically updated.

            Figure 4 One-click modification
            

            Some parameters in the DR database cannot take effect immediately, so the comparison result is temporarily inconsistent. Restart the DR database before the DR task is started or after the DR task is completed. To minimize the impact of database restart on your services, restart the DR database at the scheduled time after the disaster recovery is complete.

            For details about parameter comparison, see Parameters for Comparison in the Data Replication Service User Guide.

         3. Click Next.

5. On the displayed page, specify Start Time, Send Notification, SMN Topic, Synchronization Delay Threshold, RPO Synchronization Delay Threshold, RTO Synchronization Delay Threshold, Stop Abnormal Tasks After and DR instance details. Then, click Submit.
   Figure 5 Task startup settings
   

   Table 1 Task and recipient description

   Parameter	Description
   Start Time	Set Start Time to Start upon task creation or Start at a specified time based on site requirements. NOTE: Starting a DR task may slightly affect the performance of the service and DR databases. You are advised to start a DR task during off-peak hours.
   Send Notifications	SMN topic. This parameter is optional. If an exception occurs during disaster recovery, the system will send a notification to the specified recipients.
   SMN Topic	This parameter is available only after you enable Send Notifications and create a topic on the SMN console and add a subscriber. For details, see Simple Message Notification User Guide.
   Synchronization Delay Threshold	During disaster recovery, a synchronization delay indicates a time difference (in seconds) of synchronization between the service and DR database. If the synchronization delay exceeds the threshold you specify, DRS will send alarms to the specified recipients. The value ranges from 0 to 3,600. To avoid repeated alarms caused by the fluctuation of delay, an alarm is sent only after the delay has exceeded the threshold for six minutes. NOTE: Before setting the delay threshold, enable Send Notification. If the delay threshold is set to 0, no notifications will be sent to the recipient.
   RTO Synchronization Delay Threshold	If the synchronization delay from the DRS instance to the DR database exceeds the threshold you specify, DRS will notify specified recipients. The value ranges from 0 to 3,600. To avoid repeated alarms caused by the fluctuation of delay, an alarm is sent only after the delay has exceeded the threshold for six minutes. NOTE: Before setting the RTO delay threshold, enable Send Notification. If the delay threshold is set to 0, no notifications will be sent to the recipient.
   RPO Synchronization Delay Threshold	If the synchronization delay from the DRS instance to the service database exceeds the threshold you specify, DRS will notify specified recipients. The value ranges from 0 to 3,600. To avoid repeated alarms caused by the fluctuation of delay, an alarm is sent only after the delay has exceeded the threshold for six minutes. NOTE: Before setting the delay threshold, enable Send Notification. If the delay threshold is set to 0, no notifications will be sent to the recipient. In the early stages of an incremental disaster recovery, the synchronization delay is long because a large quantity of data is awaiting synchronization. In this case, no notifications will be sent.
   Stop Abnormal Tasks After	Number of days after which an abnormal task is automatically stopped. The value must range from 14 to 100. The default value is 14. NOTE: Tasks in the abnormal state are still charged. If tasks remain in the abnormal state for a long time, they cannot be resumed. Abnormal tasks run longer than the period you set (unit: day) will automatically stop to avoid unnecessary fees.

6. After the DR task is submitted, view and manage it on the Disaster Recovery Management page.
   • You can view the task status. For more information about task status, see Task Statuses.
   • You can click in the upper-right corner to view the latest task status.

Method 2

1. On the Disaster Recovery Management page, click the target DR task in the Task Name/ID column.
2. On the displayed page, click edit this task to go to the Configure Source and Destination Databases page.
3. Perform 2 through 6 in method 1.