# Service quotas for Amazon FSx for Lustre
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Following, you can find out about quotas when working with Amazon FSx for Lustre.

**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 that you can increase
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Following are the quotas for Amazon FSx for Lustre per Amazon account, per Amazon Region, which you can increase.


****  

| Resource | Default | Description | 
| --- | --- | --- | 
|  Lustre Persistent 1 file systems  |  100  |  The maximum number of Amazon FSx for Lustre Persistent 1 file systems that you can create in this account.  | 
|  Lustre Persistent 2 file systems  |  100  |  The maximum number of Amazon FSx for Lustre Persistent 2 file systems that you can create in this account.  | 
|  Lustre Persistent HDD storage capacity (per file system)  |  102000  |  The maximum amount of HDD storage capacity (in GiB) that you can configure for an Amazon FSx for Lustre persistent file system.  | 
|  Lustre Persistent 1 file storage capacity  |  100800  |  The maximum amount of storage capacity (in GiB) that you can configure for all Amazon FSx for Lustre Persistent 1 file systems in this account.  | 
|  Lustre Persistent 2 file storage capacity  |  100800  |  The maximum amount of storage capacity (in GiB) that you can configure for all Amazon FSx for Lustre Persistent 2 file systems in this account.  | 
|  Lustre Scratch file systems  |  100  |  The maximum number of Amazon FSx for Lustre scratch file systems that you can create in this account.  | 
|  Lustre Scratch storage capacity  |  100800  |  The maximum amount of storage capacity (in GiB) that you can configure for all Amazon FSx for Lustre scratch file systems in this account.  | 
|  Lustre Persistent Intelligent-Tiering throughput capacity  |  100000  |  The total amount of throughput capacity (in MBps) allowed for all Amazon FSx for Lustre Intelligent-Tiering file systems in this account.  | 
| Lustre Persistent Intelligent-Tiering SSD read cache storage capacity  |  100800  |  The maximum amount of provisioned SSD read cache storage capacity (in GiB) that you can configure for all Amazon FSx for Lustre Intelligent-Tiering file systems in this account.  | 
|  Lustre backups  |  500  |  The maximum number of user-initiated backups that you can have for all Amazon FSx for Lustre file systems in this account.  | 

**To request a quota increase**

1. Open the [Amazon Web Services 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
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Following are the limits on Amazon FSx for Lustre resources for each file system in an Amazon 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 | 
| Number of file updates from linked S3 bucket per file systems | 10 million / month | 
| Minimum storage capacity, SSD file systems | 1.2 TiB | 
| Minimum storage capacity, HDD file systems | 6 TiB | 
| Minimum throughput per unit of storage, SSD | 50 MBps | 
| Maximum throughput per unit of storage, SSD | 1000 MBps | 
| Minimum throughput per unit of storage, HDD | 12 MBps | 
| Maximum throughput per unit of storage, HDD | 40 MBps | 

## Additional considerations
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In addition, note the following:
+ You can use each Amazon Key Management Service (Amazon KMS) key on up to 125 Amazon FSx for Lustre file systems.
+ For a list of Amazon 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*.