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

Prerequisites

Before you begin, ensure that you have:

• Created the replication pairs you want to add to the group

• Verified that the replication pairs are in the Created or Stopped state

• Confirmed that all replication pairs share the same production region, production zone, disaster recovery region, and disaster recovery zone

Step 1: Create the group

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.

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

5. In the right panel, complete the configuration and click Confirm.

   Parameter	Description	Example
   Group name	A name for the replication pair-consistent group.	my-replication-group
   Production region	Auto-selected as the current region. Must match the region of the primary disk. No configuration required.	cn-hangzhou
   Production zone	Must be the same zone as the primary disk.	cn-hangzhou-h
   Disaster recovery region	Must be the same region as the secondary disk.	cn-shanghai
   Disaster recovery zone	Must be the same zone as the secondary disk.	cn-shanghai-b
   RPO (Minutes)	The recovery point objective (RPO) of the group. Auto-configured. No configuration required.	—
   Replication Time Control (RTC)	Optional. When enabled, provides an RPO of 10 minutes or less for data replication from the primary disk to the secondary disk. Modifiable after creation.	Enabled

Step 2: Add replication pairs to the group

Review the following constraints before adding replication pairs.

Limits:

• Each group supports up to 17 replication pairs.

• All replication pairs being added and the group must be in the Created or Stopped state.

• The replication direction must be consistent: all pairs and the group must share the same production region, production zone, disaster recovery region, and disaster recovery zone.

• After replication pairs are added to a group, you cannot activate, stop, fail over, or reverse-replicate them individually. Manage these operations at the group level.

Replication Time Control (RTC) compatibility:

When the RTC status of the group and the pair you're adding differ, the following rules apply:

To add replication pairs:

1. In the replication pair-consistent group list, click the group ID.

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

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

Step 3: Activate the group

1. In the replication pair-consistent group list, find the group and click Activate in the Actions column.

   Activating the group activates all replication pairs in it.

2. Choose a synchronization method:

   • One-time data synchronization: Click Copy Now. A one-time replication starts immediately. After it completes, the group enters the Stopped state. Click Copy Now again later to run another one-time sync.

     Note: The group must be in the Created, One-time Syncing, or Stopped state to use this option.

   • Automatic data synchronization: Click Confirm. The system replicates data automatically every 15 minutes.

     Note: The group must be in the Created, Syncing, Normal, or Stopped state to use this option.

When the group status changes to Normal, the initial disk synchronization is complete. The system then replicates data from the primary site to the secondary site at 15-minute intervals.

More operations

API reference

To automate these operations, use the following API operations:

• Create a replication pair-consistent group: CreateDiskReplicaGroup

• Modify a group's name, description, or RPO: ModifyDiskReplicaGroup

• Query replication pair-consistent groups in a region: DescribeDiskReplicaGroups

• Add a replication pair to a group: AddDiskReplicaPair

• Activate a replication pair-consistent group: StartDiskReplicaGroup