Object Storage Service (OSS) throttles bandwidth and queries per second (QPS) when you upload data to and download data from OSS.
You can run the probe command in ossutil to check the network status. For more information, see probe.
Bandwidth
The following table describes the maximum bandwidth of a single Alibaba Cloud account in different regions.
Region | Total download bandwidth for internal networks and the Internet | Internet download bandwidth | Total upload bandwidth for internal networks and the Internet | Internet upload bandwidth |
China (Shanghai) | 100 Gbit/s | 10 Gbit/s | 20 Gbit/s | 10 Gbit/s |
China (Shenzhen) | 100 Gbit/s | 10 Gbit/s | 20 Gbit/s | 10 Gbit/s |
China (Beijing) | 100 Gbit/s | 10 Gbit/s | 20 Gbit/s | 10 Gbit/s |
China (Hangzhou) | 10 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 10 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
China (Zhangjiakou) | 20 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 20 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
China (Nanjing - Local Region) | 2 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 2 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
China (Fuzhou - Local Region) | 2 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 2 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
China (Wuhan - Local Region) | 2 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 2 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
South Korea (Seoul) | 2 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 2 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
Thailand (Bangkok) | 2 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 2 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
Other regions in the Chinese mainland | 10 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 10 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
Other regions outside the Chinese mainland | 5 Gbit/s | No additional limits apply, but the Internet download bandwidth is limited to the total download bandwidth for internal networks and the Internet. | 5 Gbit/s | No additional limits apply, but the Internet upload bandwidth is limited to the total upload bandwidth for internal networks and the Internet. |
If the maximum bandwidth is reached, new requests are throttled. When a request is throttled, the response to the request contains the x-oss-qos-delay-time: number header, in which number indicates the duration in milliseconds for which the request is throttled. For a throttled upload request, this header indicates the exact duration of throttling. For a throttled download request, this header indicates a throttling duration estimated based on the extent of throttling and the object size.
If your business (for example, offline big data processing) requires a higher bandwidth limit, contact technical support.
You are not charged for a bandwidth increase. You are still charged based on traffic after the bandwidth is increased. For more information, see Traffic fees.
Queries per second (QPS)
The total QPS for an Alibaba Cloud account is 10,000. The actual maximum QPS performance varies based on the read and write modes:
Read/write mode | QPS |
Sequential read and write | 2,000 |
Non-sequential read and write | 10,000 |
If you upload a large number of objects and the names of the objects contain sequential prefixes such as timestamps and letters, multiple object indexes may be stored in a single partition. In this case, if you send a large number of requests to query these objects, latency is increased. We recommend that you do not name the objects with sequential prefixes if you want to upload a large number of objects. For more information about how to change sequential prefixes to random prefixes, see OSS performance and scalability best practices.
If your business requires a higher QPS limit, contact technical support.
The bandwidth and QPS limits of OSS also affect the bandwidth that you use to download data from OSS to Alibaba Cloud CDN. Alibaba Cloud CDN caches hot data to reduce the number of requests that are sent to download static resources from OSS.