Limitations of S3

Last update: March 26 2026

We recommend loading objects larger than 1 GB using segmented loading via the S3 API or Swift API.

Storage limits and vault limits you set on your own.

Limitations of S3 entities

Buckets

Maximum number of buckets in the project	2 000 *
Maximum number of buckets with Virtual-Hosted addressing in a project	100 ** (within 2,000)
Maximum size of the name of the bucket	128 UTF-8 characters
Maximum size of the Bucket Policy	20 KB.
Maximum number of objects in a package	Not limited

* The first 1000 bucks are displayed in the control panel. If there are more baquettes, you can view the full list via API.

** Can be enlarged upon request.

Objects

Maximum object size	50 TB.
Maximum object name size	1024 UTF-8 characters
Minimum size of data to be downloaded in one request	0 bytes
Maximum size of data to be downloaded per request	5 GB.
Minimum segment size for segmented loading	1 byte
Maximum number of segments for segmented loading	10 000

Headings

Maximum size of all headers/metadata per account/basket/object in the request body	8 KB
Maximum size of all headers/metadata of the X-Account-Meta-$Name, X-Container-Meta-$Name, X-Object-Meta-$Name type.	4 KB
Maximum number of headers per account, bucket or object	90
Maximum header name size	64 UTF-8 characters
Maximum number of characters in the title value	256 UTF-8 characters
Maximum total header size	320 UTF-8 characters (64 characters + 256 characters)

Limitations of API requests

The limits are for a single buckets. If your load profile exceeds these limits, we recommend distributing the load among multiple buckets at a rate of no more than 250 requests per second (RPS) per bucket.

If the limit is exceeded, the server will return a response with the code 429 Too Many Requests and the message Rate Limit exceeded.

S3 API

Type of requests	Limit (requests per second)	Message from the server
All inquiries	2 000	Too many authorized requests
GET + HEAD	1 000	Too many GET requests
POST	200	Too many POST requests
PUT	300	Too many PUT requests
DELETE	300	Too many DELETE requests

Swift API

Type of requests	Limit (requests per second)	Message from the server
All inquiries	2 000	Too many authorized requests
GET + HEAD	1 000	Too many GET requests
POST	300	Too many POST requests
PUT (without X-Copy-Form)	300	Too many PUT requests
PUT (with X-Copy-Form)	200	Too many PUT requests
COPY	200	Too many COPY requests
DELETE	300	Too many DELETE requests