This operation enables you to create a remote replication pair between a local volume and a remote volume, so that data in the local volume can be backed up to the remote volume. When a disaster occurs, you can use the remote backup data to reconstruct data on the local end. Alternatively, you can directly take over services from the remote end to minimize data loss and shorten service interruption time.
Prerequisites
- The remote replication license is valid.
- The local and remote storage systems support the remote replication function.
- The remote volume of the remote replication pair is not mapped to the host.
- The local volume is not configured with features that are mutually exclusive with the remote replication function.
- A replication cluster has been configured and a remote device has been added.
- The remote resource ID has been obtained. To obtain the remote resource ID, log in to the remote device and choose Resources > Volume. On the page that is displayed, click
and select the desired volume ID, and view the ID of the remote resource whose capacity is the same as that of the local resource.
Procedure
- Choose Data Protection > Protection Entity > Volume > Remote Replication Pair.
- Click Create.
The Create Remote Replication Pair dialog box is displayed.
- Configure basic information about the remote replication pair. Table 1 describes related parameters.
Table 1 Remote replication pair parameters Parameter
Description
Sync Type
Indicates the data synchronization mode between primary and secondary resources. Possible options are as follows:
- 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. When the time specified in Interval has elapsed, the system automatically starts to synchronize data between primary and secondary resources again.
NOTE:
If the latest synchronization is still being executed after the time specified in Interval has elapsed, data synchronization will start after the latest 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
Indicates the synchronization interval for Timed wait after sync begins and Timed wait after sync ends.
[Value range]
- The value is an integer ranging from 1 to 1440 when minutes is used as the unit.
- The value is an integer ranging from 10 to 86400 when seconds is used as the unit.
NOTE:This parameter is available only when Sync Type is set to Timed wait after sync begins or Timed wait after sync ends.
Time Policy
Specific 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 Type is set to Specific time policy.
Initial Sync
Indicates the initial data synchronization mode between the primary resource and secondary resource. Possible options are as follows:
- Inconsistent primary and secondary resource data. Data is automatically synchronized after pair creation: After a remote replication pair is created, data on the secondary resource is overwritten immediately. Ensure that the data on the secondary resource is no longer necessary or has been backed up.
- Inconsistent primary and secondary resource data. Manually synchronize data after pair creation: After a remote replication pair is created, manually synchronize data between the primary and secondary resources in a timely manner to ensure data consistency.
- Consistent primary and secondary resource data. Data synchronization is not required: Ensure that the data on the primary and secondary resources is consistent. If the data is inconsistent, the secondary resource cannot be used to recover data or take over services from the primary resource when the primary resource fails. As a result, data loss and service interruption may occur. This option is not displayed when the resource type is Namespace.
Remote Replication Consistency Group
Indicates the consistency group to which the newly created remote replication pair belongs.
NOTE:If no remote replication consistency group is available, you can click Create to create a remote replication consistency group and add the remote replication pair to the consistency group.
- Select the local and remote resources of the remote replication pair.
- Select a replication cluster in Local Device and Remote Device respectively.
- In the Local Resource pane, select the desired local resource and enter the remote resource ID.
To query the remote resource ID, log in to the remote device, choose Resources > Volume, click
, and select the desired volume ID. - Click Sync Parameters and set advanced properties of the remote replication pair. Table 2 describes related parameters. Then click OK.
Table 2 Remote replication synchronization parameters Parameter
Description
Speed
Indicates the data synchronization speed of the remote replication pair. The value ranges from 1 MB/s to 1024 MB/s (or 1024 KB/s to 1,048,576 KB/s). The default value is 32 MB/s.
Recovery Policy
Indicates whether the system automatically synchronizes data after a remote replication fault is rectified. The default value is Automatic.
[Value range]
- Automatic: indicates that suspended tasks automatically resume once the system recovers.
- Manual: indicates that after the system recovers, the running status of the replication pair is displayed as To be recovered. You can check the system and then determine whether to manually resume suspended tasks.
- Click OK.