Elastic Compute Service:Create and start a replication pair-consistent group

Procedure

1. Log on to the Elastic Block Storage (EBS) console.

2. In the left-side navigation pane, choose Enterprise-level Features > Replication Pair-consistent Group.

3. In the top navigation bar, select the region and resource group of the resource that you want to manage.

4. Create a replication pair-consistent group.

   1. Click the Primary Site or Secondary Site tab and then click Create Replication Pair-consistent Group.

   2. In the right panel, complete the following configuration items and click Confirm.

      The following describes the configuration items:

      Parameter	Description
      Group Name	Enter a name for the replication pair-consistent group.
      Production Region	This parameter does not require configuration. The current region is selected by default and must be the same as the region of the primary disk for asynchronous replication.
      Production Zone	The production site must be in the same zone as the primary disk for asynchronous replication.
      Disaster Recovery Region	The disaster recovery site must be in the same region as the secondary disk for asynchronous replication.
      Disaster Recovery Zone	For asynchronous replication, the disaster recovery site and the secondary disk must be in the same zone.
      RPO (Minutes)	The recovery point objective (RPO) of the replication pair-consistent group. This parameter does not require configuration.
      Replication Time Control (RTC)	You can enable Replication Time Control (RTC), which provides an RPO <= 10 minutes for data replication from the primary disk to the secondary disk. This setting can be modified after creation.

5. Add multiple replication pairs to the replication pair-consistent group.

   When adding asynchronous replication to a replication pair-consistent group, the following limits apply:

   • The replication pairs that you want to add to a replication pair-consistent group and the group must be in the Created or Stopped state.

   • The replication direction is the same for an asynchronous replication and a replication pair-consistent group, and is defined by a shared production region, production zone, disaster recovery region, and disaster recovery zone.

   • You can add up to 17 replication pairs to a replication pair-consistent group.

   • After you add replication pairs to a replication pair-consistent group, you cannot separately perform activation, stop, failover, or reverse replication operations on the replication pairs. You can perform the preceding operations on the replication pair-consistent group to manage the replication pairs in a centralized manner.

   • RTC Status Restrictions:

     RTC status of the replication pair-consistent group	RTC status of the replication pair to be added	Add a Result
     RTC enabled	RTC enabled	Yes, you can.
     RTC enabled	RTC disabled	The system automatically enables RTC for the replication pair. Important When the replication pair is removed from the group, its RTC status is restored to Disabled.
     RTC disabled	RTC enabled	The pair cannot be added. You must enable RTC for the replication pair-consistent group or disable RTC for the async replication pair to make their statuses consistent before you proceed.
     RTC disabled	RTC disabled	You can add it.

   1. In the replication pair-consistent group list, find the replication pair-consistent group that you want to manage and click the group ID.

   2. On the details page of the replication pair-consistent group, click Add replication pair.

   3. In the Add Replication Pairs to the Replication Pair-consistent Group dialog box, select the replication pairs that you want to add and click Confirm.

6. Activate the replication pair-consistent group.

   1. In the replication pair-consistent group list, find the replication pair-consistent group that you want to activate and click Activate in the Actions column.

      After you activate the replication pair-consistent group, all replication pairs in the group are activated.

   2. Choose an activation method as needed.

      • One-time data sync

        Click Copy Now. A one-time data replication starts immediately. After the replication is complete, the group enters the Stopped state. You can click Copy Now again later to perform another one-time data sync.

        When you click Copy Now, the replication pair-consistent group must be in the Created, One-time Syncing, or Stopped state.

      • Automatic data sync

        Click Confirm. The system then automatically replicates data every 15 minutes.

        When you click Confirm, the replication pair-consistent group must be in the Created, Syncing, Normal, or Stopped state.

      When the status of the replication pair-consistent group changes to Normal, the async replication feature is enabled and the initial synchronization of disk data is complete. Then, the system automatically replicates data from disks in the primary site to the disks in the secondary site at 15-minute intervals for geo-disaster recovery.

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