Create an asynchronous replication pair

Asynchronous replication copies data from a local block device to a remote block device based on a replication relationship called asynchronous replication pair. When the local block device fails, its backup data on the remote block device can be used to fast resume services.

Restrictions and guidelines

The local and remote block devices must have the same capacity.

Procedure

  1. On the top navigation bar, click Storage, and then select Storage Disaster Recovery from the left navigation pane.

  1. Click the Async Remote Replication tab.

  1. Click Add.

Figure-1 Creating an asynchronous replication pair

 

  1. In the dialog box that opens, select a remote device and then click Next.

 

  1. In the Primary Block Device section, select a disk pool and a data pool. Then, select a primary block device and then click Next.

 

  1. In the Secondary Block Device section, select a disk pool and a data pool. Then, select a secondary block device and then click Next.

  1. Configure replication settings.

 

As a best practice, select the automatic initial synchronization mode. If you select another option, you must manually synchronize data before a recover plan test.

 

Parameter

Description

Initial Sync

Specify an initial synchronization policy for the asynchronous replication pair.

  • Automatic—The system automatically synchronizes the primary and secondary block devices for data consistency immediately after the replication pair is created.

  • Manual—Make sure you perform synchronization after the replication pair is created. The pair will stay in Split state until you perform a manual synchronization.

  • Skip—Select this option only if you are sure that the primary and secondary block devices have data consistency.

Speed

Specify a data replication speed.

  • Low—The speed is equal to or lower than 5 Mbps.

  • Medium—The speed is equal to or lower than 20 Mbps.

  • High—The speed is equal to or lower than 70 Mbps.

  • Ultra—The speed is not limited and depends on the network condition of the cluster.

Restore Mode

Specify a restoration mode for the asynchronous replication pair.

  • Auto—After a failure, the system will automatically perform synchronization periodically to recover data from the failure.

  • Manual—After a failure, the system will not perform an automatic synchronization. You can manually recover data from More Actions > Sync on the Async Remote Replication tab.

Sync Policy

Specify a timing policy for scheduled automatic synchronization between the primary and secondary block devices.

  • Interval-Based (Timer Starts on Start of Sync)—Timer starts upon the start of this synchronization. The next synchronization automatically starts after the interval timer expires.

  • Interval-Based (Timer Starts on Completion of Sync)—Timer starts upon the completion of this synchronization. The next synchronization automatically starts after the interval timer expires.

  • Time-Based—Synchronization starts at the specified time.

  • Not Configurable—No synchronization policies are set. You can manually perform a synchronization from More Actions > Sync on the Async Remote Replication tab.

Sync Interval

Set the synchronization interval. This parameter is available if you select Interval-Based (Timer Starts on Start of Sync) or Interval-Based (Timer Starts on Completion of Sync) for Sync Policy.

Sync Time

Specify a point in time at which synchronization will be performed. This parameter is available if you select Time-Based for Sync Policy.

 

  1. Click Finish.

The asynchronous replication pair is created, and data synchronization is in progress.