This topic describes the limits and performance metrics of OSS.

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

Item Limit
Bucket
  • You can use an Alibaba Cloud account to create up to 100 buckets in the same region.
  • After a bucket is created, its name, region, and storage class cannot be modified.
  • OSS does not impose limits on the capacity of a single bucket.
Archive It takes about one minute to restore data from the frozen status to the readable status.
Object upload and download
  • Objects larger than 5 GB cannot be uploaded by using the following methods: console upload, simple upload, form upload, and append upload. Objects larger than 48.8 TB cannot be uploaded by using multipart upload.
  • If you upload an object that has the same name of an existing object in OSS, the new object overwrites the existing object.
  • If you upload a large number of objects with sequential prefixes such as timestamps and letters in the object names, multiple object indexes may be stored in a single partition. If too many requests are sent to query these objects, the responsiveness may be slow. We recommend that you do not upload a large number of objects with sequential prefixes. For more information about how to change sequential prefixes to random prefixes, see OSS performance and scalability best practices.
  • When you use an account to upload or download objects in the same region, the default bandwidth limit for the upload or download and queries per second (QPS) limit for requests are:
    • Default bandwidth limit: 10 Gbit/s in mainland China regions and 5 Gbit/s in regions outside mainland China. When this limit is reached, requests are throttled.
      Note When requests are throttled, the response header contains x-oss-qos-delay-time: number. The returned number indicates the time period during which requests are throttled. Unit: ms.
      • For an upload request, the exact time period during which requests are throttled is returned.
      • For a download request, the estimated time period during which requests are throttled is returned. The time is estimated based on the throttling status and the object size.
    • Default QPS limit: 10,000 queries/s. When this limit is reached, the requests beyond the limit are denied.

    If your business requires a greater bandwidth (10 Gbit/s to 100 Gbit/s) or QPS, for example, if you have offline big data processing requirements, contact the after-sales technical support personnel.

Object management When you change the storage class of objects by calling CopyObject in the console, the object size cannot exceed 1 GB.
Object deletion
  • You cannot recover deleted objects.
  • You can delete up to 100 objects at a time from the console. To delete more than 100 objects at a time, you must call an API operation or use SDK.
Domain name binding
  • You must complete real-name verification for your account on the Alibaba Cloud official website.
  • For domain names bound to buckets located within mainland China regions, you must apply for an ICP filing at the Ministry of Industry and Information Technology (MIIT).
  • A single bucket can be bound to up to 100 domain names, but a domain name can be bound to only a single bucket.
Lifecycle You can configure up to 1,000 lifecycle rules for each bucket.
Image Processing (IMG)
  • Limits on images
    • Source image
      • Only JPG, PNG, BMP, GIF, WebP, and TIFF objects are supported.
      • The object size cannot exceed 20 MB.
      • If you use image rotation, the width or height of the image cannot exceed 4,096 pixels.
      • Each side of the image cannot exceed 30,000 pixels.
      • The source image cannot exceed 250 million pixels in total.
    • Thumbnail
      • The product of dimensions cannot exceed 4096 × 4096 pixels.
      • Each side of the image cannot exceed 4,096 pixels.
  • Limits on image styles

    You can create up to 50 image styles in each bucket. If your business requires more than 50 styles, contact the after-sales technical support personnel.