This topic describes how to downgrade configurations of Subscription instances, including the memory size and the number of vCPUs. The changes take effect immediately after an instance is restarted.


  • Whether you can downgrade the configurations of a Subscription instance is determined by your ECS instance resource usage.
  • You can downgrade configurations of only one instance at a time.
  • You can change the instance configurations only to lower-level configurations. Changes to configurations of the same level or a higher level are not allowed.
  • You can only downgrade the configurations of each instance a maximum of three times. Configuration downgrade operations include instance configuration downgrades, bandwidth configuration downgrades, and cloud disk billing method adjustments.
  • The time interval between two downgrade operations must be at least 5 minutes.


The configurations of an instance can be downgraded only if the instance meets the following conditions:

  • The billing method is Subscription.
  • The instance is in the Stopped state.
  • The instance works properly. That is, the instance cannot be in an abnormal state, such as overdue, outdated, locked, or to be released.
  • The instance cannot have any ongoing configuration downgrade renewal process.


  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. Find the target instance. In the Actions column, choose More > Change Configuration.
  4. In the displayed dialog box, select Configuration downgrade and Instance Type.
  5. Select a desired instance type, confirm the refund amount, and read and confirm that you agree with the ECS Service Terms .
  6. Click Downgrade Now.

What to do next

Restart the instance for the new configurations to take effect.