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    Elastic Compute Service:Replication time control (RTC)

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    Elastic Compute Service:Replication time control (RTC)

    Last Updated:May 15, 2026

    Enable RTC to guarantee an RPO of 10 minutes or less for async replication, strengthening disaster recovery and data compliance.

    Usage notes

    • Supported regions:

      • Replication across zones in the same region: Supported.

      • Cross-region replication:

        • Supported only between the following regions: China (Hangzhou), China (Shanghai), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Shenzhen), China (Ulanqab), China (Heyuan), China (Guangzhou), and China (Chengdu).

        • For industry clouds, supported only between China East 2 Finance, China North 2 Finance (Preview), and China South 1 Finance.

    • Maximum write data volume: Less than 60 GB per 5-minute period for a single replication pair.

    Enable RTC for an async replication pair

    Create an async replication pair

    When you create an async replication pair, set Enable Replication Time Control (RTC) to Yes.

    Modify an existing async replication pair

    1. Log on to the EBS console. In the top navigation bar, select a region.

    2. In the left-side navigation pane, choose Enterprise-level Features > Asynchronous Replication Relationship.

    3. Find the target replication pair and enable RTC in the Replication Time Control (RTC) column.

      RTC cannot be enabled for an individual replication pair within a replication group.

    Disable RTC for an async replication pair

    1. Log on to the EBS console. In the top navigation bar, select a region.

    2. In the left-side navigation pane, choose Enterprise-level Features > Asynchronous Replication Relationship.

    3. Find the target replication pair and disable RTC in the Replication Time Control (RTC) column.

      Disabling RTC can take up to 10 minutes.
      RTC cannot be disabled for an individual replication pair within a replication group.
      Important

      After RTC is disabled, the RPO of the async replication pair is no longer guaranteed to be 10 minutes or less. Assess the impact before proceeding.

    RTC monitoring metrics

    1. Log on to the EBS console. In the top navigation bar, select a region.

    2. In the left-side navigation pane, choose Enterprise-level Features > Asynchronous Replication Relationship.

    3. Click the ID of the target async replication pair. In the Monitoring Information section, view the RTC monitoring metrics.

      Metric

      Description

      Replication latency

      The RPO, indicating the time lag of data on the secondary disk relative to the primary disk. Unit: seconds.

      For example, an RPO of 300 seconds means the secondary disk is 5 minutes behind the primary disk.

      Amount of data pending replication

      The amount of data on the primary disk pending replication to the secondary disk. Unit: bytes.

    Billing

    • No extra fees are charged for enabling RTC for same-region cross-zone async replication pairs.

    • Enabling RTC for a cross-region async replication pair incurs an additional fee based on the replicated data volume. The unit price is 0.0143 USD/GB.