Amazon FSx for Windows File Server
Windows User Guide


Following, you can find out about limits when working with Amazon FSx for Windows File Server.

Limits That You Can Increase

Following are the limits for Amazon FSx for Windows File Server for each AWS account, per AWS Region, that you can increase by contacting AWS Support.

Resource Default Limit Can Be Increased Up To
Number of file systems 100 Thousands
Total storage for all file systems 512 TiB Multiple PiBs
Total throughput capacity for all file systems 10 GBps Hundreds of GBps
Total number of user-initiated backups for all file system



To request a limit increase

  1. Open the AWS Support Center page, sign in if necessary, and then choose Create Case.

  2. Under Regarding, choose Service Limit Increase.

  3. Under Limit Type, choose the type of limit to increase, fill in the necessary fields in the form, and then choose your preferred method of contact.

Resource Limits for Each File System

Following are the limits on Amazon FSx for Windows File Server resources for each file system in an AWS Region.

Resource Limit per file system
Number of tags 50
Minimum storage capacity 300 GB
Maximum storage capacity 64 TB
Minimum throughput capacity 8 MBps
Maximum throughput capacity 2,048 MBps
Maximum number of file shares 100,000
Retention period for automated backups 35 days

For information on throughput capacity, see Getting the Best Performance in Amazon FSx for Windows File Server .

Additional Considerations

In addition, note the following:

  • You can us each AWS Key Management Service (AWS KMS) key on up to 125 Amazon FSx file systems.

  • For a list of AWS Regions where you can create file systems, see the AWS General Reference.

  • You map your file shares from Amazon EC2 instances in your virtual private cloud (VPC) with their Domain Name Service (DNS) names. You can also map your file share on your EC2-Classic instances (which are not in a VPC), but you must link them to your VPC by using ClassicLink. For more information about using ClassicLink, see ClassicLink in the Amazon EC2 User Guide for Linux Instances.

Limits Specific to Microsoft Windows

For more information, see NTFS limits on the Microsoft Windows Dev Center.