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    Dedicated Host:Configure auto failover

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    Dedicated Host:Configure auto failover

    Last Updated:Aug 26, 2026

    To minimize the impact of physical failures on your business, Alibaba Cloud provides the auto failover feature for Dedicated Hosts. When enabled, the system automatically migrates Elastic Compute Service (ECS) instances from a failed Dedicated Host to a healthy one. This topic describes how to enable or disable auto failover after you create a Dedicated Host (DDH).

    Note

    The Auto Failover switch is enabled by default when you create a dedicated host (DDH). You only need to re-enable it if it has been manually disabled.

    Limits

    ECS instances on local SSD type i2 dedicated hosts do not support self-service migration or automatic failover.

    Usage notes

    • If a local SSD-based DDH fails, you can submit a ticket to request a manual migration. However, data on the local SSDs is lost after the migration.

    • After all ECS instances on a failed dedicated host are migrated to another dedicated host, the host ID and ECS instance metadata (instance ID, private IP address, and public IP address) remain unchanged. However, the machine ID of the dedicated host changes.

    • If auto failover is not enabled and a DDH fails, you must submit a ticket to request a replacement DDH.

    Procedure

    1. Log on to the ECS console.

    2. In the left-side navigation pane, choose Instances & Images > icon1 > Dedicated Hosts.

    3. In the upper-left corner of the page, select a region and resource group.

    4. Find the target DDH. In the Host ID/Name column, hover over the host ID or name, and then click the 编辑宿主机属性 icon to the right of the host name.

    5. In the Modify DDH Information dialog box, click the asda switch to enable or disable Auto Failover as needed.

    6. Click OK.

    Result

    After you modify the auto failover configuration, find the target DDH and click Details in the Actions column. On the Host Details tab, check the status of Failover. A status of Enabled indicates that the feature is active. On the Dedicated Host details page, click the Host Details tab and confirm that Failover is displayed as On, which indicates that auto failover is enabled.

    References

    If a dedicated host has triggered an alert, call the RedeployDedicatedHost API operation to migrate it.