minio/docs/minio-limits.md

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# MinIO Server Limits Per Tenant
For best deployment experience MinIO recommends operating systems RHEL/CentOS 8.x or later, Ubuntu 18.04 LTS or later. These operating systems package the latest 'xfsprogs' that support large scale deployments.
## Erasure Code (Multiple Drives / Servers)
| Item | Specification |
|:----------------------------------------------------------------|:--------------|
| Maximum number of servers per cluster | no-limit |
| Minimum number of servers | 02 |
| Minimum number of drives per server when server count is 1 | 02 |
| Minimum number of drives per server when server count is 2 or 3 | 01 |
| Minimum number of drives per server when server count is 4 | 01 |
| Maximum number of drives per server | no-limit |
| Read quorum | N/2 |
| Write quorum | N/2+1 |
## Limits of S3 API
| Item | Specification |
|:--------------------------------------------------------------------------------|:----------------------------------------------|
| Maximum number of buckets | 500000 |
| Maximum number of objects per bucket | no-limit |
| Maximum object size | 50 TiB |
| Minimum object size | 0 B |
| Maximum object size per PUT operation | 5 TiB |
| Maximum number of parts per upload | 10,000 |
| Part size range | 5 MiB to 5 GiB. Last part can be 0 B to 5 GiB |
| Maximum number of parts returned per list parts request | 10000 |
| Maximum number of objects returned per list objects request | 1000 |
| Maximum number of multipart uploads returned per list multipart uploads request | 1000 |
| Maximum length for bucket names | 63 |
| Maximum length for object names | 1024 |
| Maximum length for '/' separated object name segment | 255 |
## List of Amazon S3 API's not supported on MinIO
We found the following APIs to be redundant or less useful outside of AWS S3. If you have a different view on any of the APIs we missed, please open a [GitHub issue](https://github.com/minio/minio/issues).
### List of Amazon S3 Bucket API's not supported on MinIO
- BucketACL (Use [bucket policies](https://min.io/docs/minio/linux/administration/identity-access-management/policy-based-access-control.html) instead)
- BucketCORS (CORS enabled by default on all buckets for all HTTP verbs)
- BucketWebsite (Use [`caddy`](https://github.com/caddyserver/caddy) or [`nginx`](https://www.nginx.com/resources/wiki/))
- BucketAnalytics, BucketMetrics, BucketLogging (Use [bucket notification](https://min.io/docs/minio/linux/administration/monitoring/bucket-notifications.html) APIs)
- BucketRequestPayment
### List of Amazon S3 Object API's not supported on MinIO
- ObjectACL (Use [bucket policies](https://min.io/docs/minio/linux/administration/identity-access-management/policy-based-access-control.html) instead)
## Object name restrictions on MinIO
- Object name restrictions on MinIO are governed by OS and filesystem limitations. For example object names that contain characters `^*|\/&";` are unsupported on Windows platform or any other file systems that do not support filenames with special charaters.
> **This list is non exhaustive, it depends on the operating system and filesystem under use - please consult your operating system vendor for a more comprehensiv list**.
MinIO recommends using Linux operating system for for production workloads.
- Objects must not have conflicting objects as parent objects, applications using this behavior should change their behavior and use non-conflicting unique keys, for example situations such as following conflicting key patterns are not supported.
```
PUT <bucketname>/a/b/1.txt
PUT <bucketname>/a/b
```
```
PUT <bucketname>/a/b
PUT <bucketname>/a/b/1.txt
```