# FileSystemConfigProperty

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) .

- Source: Generated code
- Type last changed: v2.268.0 · 2 Sep 2026

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import { aws_lambda as lambda } from 'aws-cdk-lib';
const fileSystemConfigProperty: lambda.CfnFunction.FileSystemConfigProperty = {
  arn: 'arn',
  localMountPath: 'localMountPath',

  // the properties below are optional
  s3FilesConfig: {
    directS3Read: 'directS3Read',
  },
};
```

## Properties

- `arn`: string (required) — The Amazon Resource Name (ARN) of the Amazon EFS access point that provides access to the file system.

- `localMountPath`: string (required) — The path where the function can access the file system, starting with `/mnt/` .

- `s3FilesConfig`: [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) | [CfnFunction.S3FilesConfigProperty](/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.CfnFunction.S3FilesConfigProperty.html) — Setting controls how your function accesses data from an Amazon S3 file system.