Creating an Asynchronous Remote Replication Consistency Group

Prerequisites

• A replication cluster has been configured and a remote device has been added.
• Role of a remote replication pair to be added to a consistency group is Primary.
• The secondary resources in remote replication pairs to be added to a consistency group must be from the same storage device.
• Replication Mode of a remote replication pair to be added to a consistency group must be the same as that of the consistency group.

Procedure

1. Choose Data Protection > Protection Entity > Protection Group > Remote Replication Consistency Group.
2. Click Create.

   The Create Remote Replication Consistency Group page is displayed on the right.

3. Configure basic information about the consistency group. Table 1 describes related parameters.

   Table 1 Consistency group parameters

   Parameter	Description
   Name	Name of the consistency group. [Value range] The name must be unique. The name can only contain digits, letters, underscores (_), and hyphens (-), and must start with a digit or letter. The name contains 1 to 31 characters.
   Replication Mode	Set the replication mode of the consistency group to Asynchronous.
   Replication Cluster	Replication cluster to which the consistency group belongs.
   Remote Device	Storage device to which the secondary resource of a remote replication pair to be added to the consistency group belongs.

4. (Optional) Add a remote replication pair to the remote replication consistency group.
   1. Select Add Remote Replication Pair.
   2. In the Available Remote Replication Pairs area, select one or more remote replication pairs and they are added to the Selected Remote Replication Pairs area on the right.

5. Click Advanced to set advanced properties of the remote replication consistency group. Table 2 describes related parameters.

   Table 2 Advanced remote replication consistency group parameters

   Parameter	Description
   Speed	Data synchronization speed of a remote replication consistency group. The value ranges from 1 MB/s to 1024 MB/s (or 1024 KB/s to 1,048,576 KB/s). During initial synchronization, the recommended rate is 100 MB/s or higher. During incremental synchronization, if the service is busy, the recommended rate is 0 MB/s to 20 MB/s. During incremental synchronization, if the service load is heavy, the recommended rate is 20 MB/s to 70 MB/s. During incremental synchronization, if the service is idle, the recommended rate is 100 MB/s or higher. The default value is 32 MB/s.
   Recovery Policy	Whether the system automatically synchronizes data after a remote replication fault is rectified. The default value is Automatic. [Value range] Automatic: The previous ongoing tasks automatically resume immediately after the remote replication fault is rectified. Manual: The value of Running Status changes to To be recovered after the remote replication fault is rectified. In this case, you can check the system and then determine whether to resume the previous ongoing tasks manually.
   Sync Method	Determines how data is synchronized between primary and secondary resources. [Value range] Manual: Data must be manually synchronized between primary and secondary resources. Timed wait after sync begins: The system starts timing as soon as the latest synchronization begins. After the time specified in Interval is reached, the system automatically starts data synchronization between primary and secondary resources again. NOTE: If the last synchronization has not finished after the time specified in Interval is reached, the system performs the next synchronization after the last synchronization finishes. Timed wait after sync ends: The system starts timing after the last synchronization finishes. After the time specified in Interval is reached, the system automatically starts data synchronization between primary and secondary resources again. Specific time policy: The system automatically synchronizes data between primary and secondary resources based on a specific time policy.
   Interval	Synchronization interval for Timed wait after sync begins and Timed wait after sync ends. [Value range] The interval is an integer ranging from 1 to 1440 when minutes is used as the unit. The interval is an integer ranging from 10 to 86,400 when seconds is used as the unit. NOTE: This parameter is available only when Sync Method is set to Timed wait after sync begins or Timed wait after sync ends.
   Time Policy	The system automatically synchronizes data between primary and secondary resources based on a specific time policy. [Value range] Daily: Data synchronization begins on every day. Its value ranges from 00:00 to 23:59. Hourly: Data synchronization begins in every hour. Its value is an integer ranging from 0 to 59. NOTE: This parameter is available only when Sync Method is set to Specific time policy.

6. Click OK.