# FileSystemConfig


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 Files file system](https://docs.aws.amazon.com/lambda/latest/dg/configuration-filesystem.html).

## Contents


 ** 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

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](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)