This topic describes how to query the performance mode of a burstable performance instance and switch between performance modes. A burstable performance instance can run in either the standard or unlimited mode. You can switch between performance modes by enabling or disabling the selected mode at any time.

Background information

In standard mode, if an instance has no remaining CPU credits, its CPU usage will not burst above the baseline performance. However, in unlimited mode, an instance can use advance or overdrawn CPU credits to maintain high CPU usage whenever required, but this may incur additional fees. For more information, see Unlimited mode.

  • By default, the standard mode is enabled at instance creation.
  • If a burstable performance instance is in the Stopped status and the No fees for stopped instances (VPC-Connected) feature is enabled, the instance enters the standard mode by default after it is started.
  • If a burstable performance instance is in the Stopped status and the No fees for stopped instances (VPC-Connected) feature is not enabled, the performance mode used before the instance is stopped continues to take effect after the instance is started.
  • If your account has an overdue payment, the unlimited mode will be automatically disabled and will not be enabled until you clear the overdue payment.

Query the performance mode of a burstable performance instance

  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. Find the target instance and click the instance ID.
  4. In the Basic Information area, view Instance Type.
    • Standard indicates that the instance is in standard mode.
    • Unlimited indicates that the instance is in unlimited mode.

Enable the unlimited mode

Before enabling the unlimited mode, ensure that:
  • The instance is in the Running status.
  • The standard mode is enabled.
  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. Find the target instance and click the instance ID.
  4. In the Basic Information area, choose More > Enable Unlimited Mode.
  5. In the displayed Enable Unlimited Mode dialog box, click OK.

Disable the unlimited mode

Before disabling the unlimited mode, ensure that:
  • The instance is in the Running status.
  • The unlimited mode is enabled.
  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. Find the target instance and click the instance ID.
  4. In the Basic Information area, choose More > Disable Unlimited Mode.
  5. In the displayed Disable Unlimited Mode dialog box, click OK.