This topic describes the performance metrics and limits of Object Storage Service (OSS).

The following table describes the performance metrics and limits of OSS.

Item Description
Bandwidth Default bandwidth limit: 10 Gbit/s in regions inside the Chinese mainland and 5 Gbit/s in regions outside the Chinese mainland. If this limit is reached, requests are throttled.
Note 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 over which the request is throttled. Unit: ms. For upload requests, the exact duration over which a request is throttled is returned. For download requests, the estimated duration over which a request is throttled is returned. The duration is estimated based on the extent of throttling and the downloaded object size.

If you require a higher bandwidth (10 Gbit/s to 100 Gbit/s) for your business such as offline big data processing, contact technical support.

Queries per second (QPS) The limit of the total QPS for a single account is 10,000. The actual values that can be achieved are different in different read and write modes:
  • Sequential read and write: 2,000

    If you upload a large number of objects with sequential prefixes such as timestamps and letters in the object names, many object indexes may be stored in a single partition. In this case, if you send a large number of requests to query these objects, the latency may increase. We recommend that you do not upload a large number of objects with sequential prefixes in their names. For more information about how to change sequential prefixes to random prefixes, see OSS performance and scalability best practices.

  • Non-sequential read and write: 10,000

If you require a higher QPS, contact technical support.

Bucket
  • You can use an Alibaba Cloud account to create up to 100 buckets in the same region.
  • A bucket name must be globally unique within OSS. For more information about the naming conventions of buckets, see Bucket naming conventions.
  • After a bucket is created, its name, region, storage class, and redundancy type cannot be modified.
  • OSS does not impose limits on the capacity of a bucket.
Object
  • The size of the object to upload

    When you use simple upload, form upload, or append upload to upload a single object, the object cannot exceed 5 GB in size.

    When you use multipart upload to upload a single object, the object cannot exceed 48.8 TB in size.

  • The size of the object to rename

    You can rename only objects that are up to 1 GB in size in the OSS console. To rename objects that exceed 1 GB in size, we recommend that you use ossutil.

  • The number of objects to delete

    You can delete up to 100 objects at a time in the OSS console.

    You can delete up to 1,000 objects at a time when you use OSS SDKs, ossbrowser, or ossutil.

    Warning Deleted objects cannot be recovered. Exercise caution when you delete objects.
  • Whether existing objects are overwritten by objects with the same names

    By default, when you upload an object that has the same name as an existing object, the existing object is overwritten. To prevent objects from being accidentally overwritten, you can enable versioning for the bucket in which the objects are stored. You can also include the x-oss-forbid-overwrite header in upload requests and set the value of the header to true.

Data restoration You must restore an Archive or Cold Archive object before you can access the object.
  • It takes about a minute to restore an Archive object.
  • For a Cold Archive object, the restoration period varies based on the restoration priority of the object.
    • Expedited: The object is restored within one hour.
    • Standard: The object is restored within 2 to 5 hours.
    • Bulk: The object is restored within 5 to 12 hours.
Custom domain name
  • For a domain name that is mapped to buckets located in regions inside the Chinese mainland, you must apply for an ICP filing at the Ministry of Industry and Information Technology (MIIT).
  • Up to 100 domain names can be mapped to a bucket. However, a domain name can be mapped only to a single bucket.
  • OSS does not impose limits on the number of domain names that can be mapped to the buckets of an Alibaba Cloud account.
Lifecycle rules You can configure up to 1,000 lifecycle rules for a bucket.
Back-to-origin rules
  • You can configure up to 20 back-to-origin rules for a bucket.
  • In regions inside the Chinese mainland and the China (Hong Kong) region, the default QPS for mirroring-based back-to-origin requests is 2,000, and the default bandwidth is 2 Gbit/s. In regions outside China, the default QPS for mirroring-based back-to-origin requests is 1,000, and the default bandwidth is 1 Gbit/s.
Image Processing (IMG)
  • Limits on images
    • Source images
      • Only JPG, PNG, BMP, GIF, WebP, and TIFF images are supported.
      • The size of the source image cannot exceed 20 MB.
      • For the rotate operation, the height or width of the source image cannot exceed 4,096 pixels. For other operations on images, the width or height of the source image cannot exceed 30,000 pixels, and the total number of pixels of the source image cannot exceed 250 million.

        The total number of pixels of a dynamic image, such as a GIF image, is calculated by using the following formula: Width × Height × Number of image frames. The total number of pixels of a static image, such as a PNG image, is calculated by using the following formula: Width × Height.

    • Resized images

      The width or height of a resized image cannot exceed 16,384 pixels. The total number of pixels of the resized image cannot exceed 16,777,216.

  • Limits on image styles

    You can create up to 50 image styles in each bucket. To create more styles for a bucket, contact technical support.

Resource plans
  • Resource plans that you purchase for specific regions can be used to offset only fees generated by the resource usage in the regions.
  • You can use resource plans to offset the fees generated by the resource usage in the regions that you specify when you purchase the resource plans.
  • You can purchase only one storage plan within the same validity period. However, you can renew the storage plan that you purchase. For more information about how to renew a storage plan, see Overview.
  • You can purchase multiple transfer acceleration plans and back-to-origin traffic plans within the same validity period to offset your fees. However, these plans cannot be upgraded or renewed.
  • You can purchase multiple downstream traffic plans within the same validity period to offset your fees. These plans can be renewed but cannot be upgraded.
  • No resource plans are available to offset API operation calling fees, data processing fees, and cross-region replication (CRR) traffic fees. You are charged these fees on a pay-as-you-go basis. For more information, see API fees, Data processing fees, and Traffic fees.