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Torch Object Storage

Flow control management

Configuring burst bandwidth

You can enable burst bandwidth when your workload temporarily requires higher performance than the default bandwidth limit. Once enabled, TOS automatically allocates additional temporary bandwidth based on actual usage and the applied burst bandwidth cap. This ensures smooth operation during periods of high usage while keeping bandwidth consumption within the predefined burst limit. This topic describes considerations for using burst bandwidth and provides steps to enable the feature.

tip

This feature is not currently available in Asia Pacific (Johor).

Notes

Category	Considerations
Billing	You are charged based on your actual burst bandwidth usage and the duration of your usage. If your actual traffic does not exceed your bandwidth limit, TOS will not provide you with burst bandwidth and you will not be charged any fees for it. For more information, see Burst bandwidth.
Activation criteria	Once enabled, burst bandwidth is provided automatically only when your traffic exceeds the limit. For more information on bandwidth limits, see Constraints and limitations.
Effective time	You can enable or disable burst bandwidth at any time. Typically, configuration changes take effect within two minutes.
Constraints and limitations	Burst bandwidth applies to your account's total bandwidth. Each Volcano Engine account can only configure one burst bandwidth rule per region. Essentially, burst bandwidth is extra bandwidth provided based on the availability of resources. It is not guaranteed and its availability depends on the operating conditions of TOS online resources. You may not reach the configured burst bandwidth limit when resources are tight. Please assess your business risks accordingly.

Use cases

Burst bandwidth responds automatically in real time with no cooldown period. It supports elastic scaling within the set performance limit according to business load and has no usage duration limit. Burst bandwidth is ideal for scenarios with large traffic fluctuations or unpredictable performance peaks.

Turning on burst bandwidth

Burst bandwidth is set and managed by region. Enabling burst bandwidth in a specific region helps handle sudden surges in service traffic.

In the left navigation pane, select Flow control management > Throughput quota management.

On the Throughput quota management page, click Enable under the Burst bandwidth column of the region you want to manage.

In the Enable burst bandwidth dialog box, set the burst bandwidth limit. Then, click OK to save your settings.

tip

The valid ranges for burst bandwidth are as follows:

China (Beijing) and China (Shanghai): [1,100] Gbps.

Other regions: [1,10] Gbps.

Submit a ticket if you need more burst bandwidth.

After enabling burst bandwidth, you can modify the limit by clicking Modify under the Burst bandwidth column on the Throughput quota management page for the corresponding region.

Viewing burst bandwidth configurations

In the left navigation pane, select Flow control management > Throughput quota management.

On the Throughput quota management page, view the burst bandwidth status and limit for each region.

tip

Burst bandwidth includes both upload and download bandwidth, which have the same limit. For example, if you set the burst bandwidth limit to 10 Gbps, the upload and download burst bandwidths will both be capped at 10 Gbps. The upload and download bandwidths are described as follows:

Upload bandwidth: The bandwidth available for uploading data to TOS.

Download bandwidth: The bandwidth available for downloading data from TOS.

Turning off burst bandwidth

In the left navigation pane, select Flow control management > Throughput quota management.

On the Throughput quota management page, click Delete under the Burst bandwidth column of the region you want to manage.

In the box that appears, click Delete.

Next steps

Viewing bandwidth metrics

Cloud Monitor collects and records upload and download bandwidth, as well as bandwidth quotas. In the Cloud Monitor console, you can view the upload and download bandwidth of the private and public networks for each region under your account. This helps you understand actual burst bandwidth usage and optimize resource configurations promptly.

In the left navigation pane, select Cloud product monitor. Then, choose TOS.

In the top menu bar, select the region you want to check.

On the user profile tab, click bandwidth. Then, specify a time range to view the intranet inflow and outflow bandwidth and the user bandwidth quota for that period.

Last updated: 2026.09.17 17:49:36