# FileSystemConfig
<a name="API_FileSystemConfig"></a>

Details about the connection between a Lambda function and an [Amazon EFS file system](https://docs.aws.amazon.com/lambda/latest/dg/configuration-filesystem.html) or an [Amazon S3 file system](https://docs.aws.amazon.com/lambda/latest/dg/configuration-filesystem.html).

## Contents
<a name="API_FileSystemConfig_Contents"></a>

 ** Arn **   <a name="lambda-Type-FileSystemConfig-Arn"></a>
The Amazon Resource Name (ARN) of the Amazon EFS or Amazon S3 Files access point that provides access to the file system.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Pattern: `arn:aws[a-zA-Z-]*:elasticfilesystem:[a-z]{2}((-gov)|(-iso(b?)))?-[a-z]+-\d{1}:\d{12}:access-point/fsap-[a-f0-9]{17}$|^arn:aws[-a-z]*:s3files:[0-9a-z-:]+:file-system/fs-[0-9a-f]{17,40}/access-point/fsap-[0-9a-f]{17,40}`   
Required: Yes

 ** LocalMountPath **   <a name="lambda-Type-FileSystemConfig-LocalMountPath"></a>
The path where the function can access the file system, starting with `/mnt/`.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 160.  
Pattern: `/mnt/[a-zA-Z0-9-_.]+`   
Required: Yes

 ** S3FilesConfig **   <a name="lambda-Type-FileSystemConfig-S3FilesConfig"></a>
The configuration for how your function accesses data on an Amazon S3 file system. Valid only when the file system access point ARN is an Amazon S3 Files access point. If you specify a different access point type (for example, Amazon Elastic File System), the operation returns an `InvalidParameterException`.  
Type: [S3FilesConfig](API_S3FilesConfig.md) object  
Required: No

## See Also
<a name="API_FileSystemConfig_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/lambda-2015-03-31/FileSystemConfig) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/lambda-2015-03-31/FileSystemConfig) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/lambda-2015-03-31/FileSystemConfig)