# Quotas
<a name="limits"></a>

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

**Topics**
+ [Quotas that you can increase](#soft-limits)
+ [Resource quotas for each file system](#limits-MFS-resources-file-system)
+ [Additional considerations](#limits-additional-considerations)
+ [Quotas specific to Microsoft Windows](#ntfs-limits)

## Quotas that you can increase
<a name="soft-limits"></a>

Following are the quotas for Amazon FSx for Windows File Server for each Amazon Web Services account, per Amazon Web Services Region, that you can increase.


****  

| Resource | Default | Description | 
| --- | --- | --- | 
| Windows file systems | 100 | The maximum number of Amazon FSx for Windows Server file systems that you can create in this account. | 
| Windows throughput capacity | 10240 | The total amount of throughput capacity (in MBps) allowed for all Amazon FSx for Windows file systems in this account. | 
| Windows HDD storage capacity | 524288 | The maximum amount of HDD storage capacity (in GiB) allowed for all Amazon FSx for Windows File Server file systems in this account. | 
| Windows SSD storage capacity | 524288 | The maximum amount of SSD storage capacity (in GiB) allowed for all Amazon FSx for Windows File Server file systems in this account. | 
| Windows total SSD IOPS | 500,000 | The total amount of SSD IOPS allowed for all Amazon FSx for Windows File Server file systems in this account. | 
| Windows backups | 500 | The maximum number of user-initiated backups for all Amazon FSx for Windows File Server file systems that you can have in this account. | 

**To request a quota increase**

1. Open the [Amazon Support Center](https://console.amazonaws.cn/support/home#/) page, sign in if necessary, and then choose **Create case**.

1. For **Create case**, choose **Account and billing support**.

1. In the **Case details** panel make the following entries:
   + For **Type** choose **Account**.
   + For **Category** choose **Other Account Issues**.
   + For **Subject** enter **FSx for Windows File Server service limit increase request**.
   + Provide a detailed **Description** of your request, including:
     + The FSx quota that you want increased, and the value you want it increased to, if known.
     + The reason why you are seeking the quota increase.
     + The file system id and region for each file system you are requesting an increase for.

1. Provide your preferred **Contact options** and choose **Submit**.

## Resource quotas for each file system
<a name="limits-MFS-resources-file-system"></a>

Following are the quotas on Amazon FSx for Windows File Server resources for each file system in an Amazon Web Services Region.


****  

| Resource | Limit per file system | 
| --- | --- | 
| Maximum number of tags | 50 | 
| Maximum retention period for automated backups | 90 days | 
| Maximum number of backup copy requests in progress to a single destination Region per account. | 5 | 
| Minimum storage capacity, SSD file systems | 32 GiB | 
| Minimum storage capacity, HDD file systems | 2,000 GiB | 
| Maximum storage capacity, SSD and HDD | 64 TiB | 
| Minimum SSD IOPS | 96 | 
| Maximum SSD IOPS | 400,000 | 
| Minimum throughput capacity | 8 MBps | 
| Maximum throughput capacity | 12,288 MBps | 
| Maximum number of file shares | 100,000 | 

## Additional considerations
<a name="limits-additional-considerations"></a>

In addition, note the following:
+ You can use each Amazon Key Management Service (Amazon KMS) key on up to 125 Amazon FSx file systems.
+ For a list of Amazon Web Services Regions where you can create file systems, see [Amazon FSx Endpoints and Quotas](https://docs.amazonaws.cn/general/latest/gr/fsxn.html) in the *Amazon Web Services General Reference*.
+ You map your file shares from Amazon EC2 instances in your virtual private cloud (VPC) with their Domain Name Service (DNS) names.

## Quotas specific to Microsoft Windows
<a name="ntfs-limits"></a>

For more information, see [NTFS](https://docs.microsoft.com/en-us/windows/desktop/FileIO/filesystem-functionality-comparison#limits) limits on the Microsoft Windows Dev Center.