DescribeFileSystems - Amazon Elastic File System


Returns the description of a specific Amazon EFS file system if either the file system CreationToken or the FileSystemId is provided. Otherwise, it returns descriptions of all file systems owned by the caller's AWS account in the AWS Region of the endpoint that you're calling.

When retrieving all file system descriptions, you can optionally specify the MaxItems parameter to limit the number of descriptions in a response. This number is automatically set to 100. If more file system descriptions remain, Amazon EFS returns a NextMarker, an opaque token, in the response. In this case, you should send a subsequent request with the Marker request parameter set to the value of NextMarker.

To retrieve a list of your file system descriptions, this operation is used in an iterative process, where DescribeFileSystems is called first without the Marker and then the operation continues to call it with the Marker parameter set to the value of the NextMarker from the previous response until the response has no NextMarker.

The order of file systems returned in the response of one DescribeFileSystems call and the order of file systems returned across the responses of a multi-call iteration is unspecified.

This operation requires permissions for the elasticfilesystem:DescribeFileSystems action.

Request Syntax

GET /2015-02-01/file-systems?CreationToken=CreationToken&FileSystemId=FileSystemId&Marker=Marker&MaxItems=MaxItems HTTP/1.1

URI Request Parameters

The request uses the following URI parameters.


(Optional) Restricts the list to the file system with this creation token (String). You specify a creation token when you create an Amazon EFS file system.

Length Constraints: Minimum length of 1. Maximum length of 64.

Pattern: .+


(Optional) ID of the file system whose description you want to retrieve (String).

Length Constraints: Maximum length of 128.

Pattern: ^(arn:aws[-a-z]*:elasticfilesystem:[0-9a-z-:]+:file-system/fs-[0-9a-f]{8,40}|fs-[0-9a-f]{8,40})$


(Optional) Opaque pagination token returned from a previous DescribeFileSystems operation (String). If present, specifies to continue the list from where the returning call had left off.

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: .+


(Optional) Specifies the maximum number of file systems to return in the response (integer). This number is automatically set to 100. The response is paginated at 100 per page if you have more than 100 file systems.

Valid Range: Minimum value of 1.

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200 Content-type: application/json { "FileSystems": [ { "AvailabilityZoneId": "string", "AvailabilityZoneName": "string", "CreationTime": number, "CreationToken": "string", "Encrypted": boolean, "FileSystemArn": "string", "FileSystemId": "string", "KmsKeyId": "string", "LifeCycleState": "string", "Name": "string", "NumberOfMountTargets": number, "OwnerId": "string", "PerformanceMode": "string", "ProvisionedThroughputInMibps": number, "SizeInBytes": { "Timestamp": number, "Value": number, "ValueInIA": number, "ValueInStandard": number }, "Tags": [ { "Key": "string", "Value": "string" } ], "ThroughputMode": "string" } ], "Marker": "string", "NextMarker": "string" }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


An array of file system descriptions.

Type: Array of FileSystemDescription objects


Present if provided by caller in the request (String).

Type: String

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: .+


Present if there are more file systems than returned in the response (String). You can use the NextMarker in the subsequent request to fetch the descriptions.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: .+



Returned if the request is malformed or contains an error such as an invalid parameter value or a missing required parameter.

HTTP Status Code: 400


Returned if the specified FileSystemId value doesn't exist in the requester's AWS account.

HTTP Status Code: 404


Returned if an error occurred on the server side.

HTTP Status Code: 500


Retrieve a list of 10 file systems

The following example sends a GET request to the file-systems endpoint ( The request specifies a MaxItems query parameter to limit the number of file system descriptions to 10.

Sample Request

GET /2015-02-01/file-systems?MaxItems=10 HTTP/1.1 Host: x-amz-date: 20140622T191208Z Authorization: <...>

Sample Response

HTTP/1.1 200 OK x-amzn-RequestId: 01234567-89ab-cdef-0123-456789abcdef Content-Type: application/json Content-Length: 499 { "FileSystems":[ { "OwnerId":"251839141158", "CreationToken":"MyFileSystem1", "FileSystemId":"fs-01234567", "PerformanceMode" : "generalPurpose", "CreationTime":"1403301078", "LifeCycleState":"created", "Name":"my first file system", "NumberOfMountTargets":1, "SizeInBytes":{ "Timestamp": 1403301078, "Value": 29313417216, "ValueInIA": 675432, "ValueInStandard": 29312741784 } } ] }

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: