This topic describes how to enable ABSR to synchronize cloud disk data to other regions and implement geo-disaster recovery of data.

Background information

ABSR is supported between the following regions:
  • Mutual replication is supported between the following regions:
    • China (Beijing): Zone F and Zone G
    • China (Shanghai): Zone B and Zone F
    • China (Heyuan): Zone A and Zone B
  • Mutual replication is supported between the following regions:
    • US (Silicon Valley): Zone A and Zone B
    • US (Virginia): Zone A and Zone B

In a replication relationship, the primary disk is a pay-as-you-go data disk of the enhanced SSD (ESSD) disk category and cannot be a secondary disk in another replication relationship. The secondary disk is a cloud disk that has the same specifications and capacity as the primary disk. Each cloud disk (primary or secondary disk) can have only a single replication relationship.

The following table describes the limits on the primary and secondary disks after a replication relationship is configured.

Item Support for the primary disk Support for the secondary disk
Read and write operations Yes No
Deletion No* No*
Re-initialization No No
Resizing No No
Attachment Yes No*
Snapshot creation Yes No*
Performance type modification No No
Encryption No No
Note *: The operation is supported after the replication relationship is deleted.

Step 1: Create a replication relationship

To use the ABSR feature, you must create a replication relationship first.

  1. Go to the Asynchronous replication of cloud disks page.
    1. Log on to the ECS console.
    2. In the left-side navigation pane, choose Storage & Snapshots > Asynchronous Replication Relationship.
    3. In the top navigation bar, select a region.
  2. Click Create asynchronous replication of cloud disks.
  3. In the Select the primary site resource for asynchronous replication step, configure the parameters for the primary disk. Then, click Next: Create Target Site Resource.
    The following table describes the parameters to configure for the primary disk.
    Parameter Description
    Region and zone Select the region and zone of the primary disk whose data you want to synchronize.
    Cloud disk Select the primary disk whose data you want to synchronize.
  4. In the Create target site resources step, create a secondary disk. Then, click Order cloud disk.
    The following table describes the parameters to configure for the secondary disk.
    Parameter Description
    Region and zone copied The destination region and zone of the secondary disk.
    Type of payment Select the billing method of the secondary disk. Only the pay-as-you-go billing method is supported.
    Cloud disk name Specify the name of the secondary disk
    Label Configure the tag key and value of the secondary disk. You can use tags to manage disks.
    Service Agreement Read and select cloud server ECS Terms of Service.

    After you click Order cloud disk, a pay-as-you-go disk that has the same category and capacity as the primary disk is created in the destination region.

  5. In the Create a cloud disk asynchronous replication relationship step, configure the parameters described in the following table. Then, click Next: Order Overview.
    Parameter Description
    Copy pair name Specify a name for the replication relationship.
    Description Specify a description for the replication relationship.
    Minimum synchronization period Specify a minimum synchronization cycle for asynchronous replication. Data in the primary disk is synchronized to the secondary disk based on the minimum synchronization cycle.
  6. In the Order overview step, confirm the information about the primary disk, secondary disk, and replication relationship. Then, click Confirm order.

Step 2: Activate the replication relationship

After a replication relationship is created, it is in the To be activated (inactive) state. You must activate the replication relationship before data can be periodically synchronized to the secondary disk.

  1. In the left-side navigation pane, choose Storage & Snapshots > Asynchronous Replication Relationship.
  2. Find the replication relationship that you want to activate and click Activation in the Operation column.
    After the replication relationship is activated, data on the primary disk is automatically synchronized to the secondary disk based on the synchronization cycle to implement geo-disaster recovery.