[ aws . efs ]



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. Currently, this number is automatically set to 10. 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.

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

describe-file-systems is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: FileSystems


[--max-items <value>]
[--creation-token <value>]
[--file-system-id <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--generate-cli-skeleton <value>]
[--cli-auto-prompt <value>]


--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--creation-token (string)

(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.

--file-system-id (string)

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

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

--cli-auto-prompt (boolean) Automatically prompt for CLI input parameters.

See ‘aws help’ for descriptions of global parameters.


Marker -> (string)

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

FileSystems -> (list)

An array of file system descriptions.


A description of the file system.

OwnerId -> (string)

The AWS account that created the file system. If the file system was created by an IAM user, the parent account to which the user belongs is the owner.

CreationToken -> (string)

The opaque string specified in the request.

FileSystemId -> (string)

The ID of the file system, assigned by Amazon EFS.

FileSystemArn -> (string)

The Amazon Resource Name (ARN) for the EFS file system, in the format arn:aws:elasticfilesystem:*region* :*account-id* :file-system/*file-system-id* `` . Example with sample data: ``arn:aws:elasticfilesystem:us-west-2:1111333322228888:file-system/fs-01234567

CreationTime -> (timestamp)

The time that the file system was created, in seconds (since 1970-01-01T00:00:00Z).

LifeCycleState -> (string)

The lifecycle phase of the file system.

Name -> (string)

You can add tags to a file system, including a Name tag. For more information, see CreateFileSystem . If the file system has a Name tag, Amazon EFS returns the value in this field.

NumberOfMountTargets -> (integer)

The current number of mount targets that the file system has. For more information, see CreateMountTarget .

SizeInBytes -> (structure)

The latest known metered size (in bytes) of data stored in the file system, in its Value field, and the time at which that size was determined in its Timestamp field. The Timestamp value is the integer number of seconds since 1970-01-01T00:00:00Z. The SizeInBytes value doesn’t represent the size of a consistent snapshot of the file system, but it is eventually consistent when there are no writes to the file system. That is, SizeInBytes represents actual size only if the file system is not modified for a period longer than a couple of hours. Otherwise, the value is not the exact size that the file system was at any point in time.

Value -> (long)

The latest known metered size (in bytes) of data stored in the file system.

Timestamp -> (timestamp)

The time at which the size of data, returned in the Value field, was determined. The value is the integer number of seconds since 1970-01-01T00:00:00Z.

ValueInIA -> (long)

The latest known metered size (in bytes) of data stored in the Infrequent Access storage class.

ValueInStandard -> (long)

The latest known metered size (in bytes) of data stored in the Standard storage class.

PerformanceMode -> (string)

The performance mode of the file system.

Encrypted -> (boolean)

A Boolean value that, if true, indicates that the file system is encrypted.

KmsKeyId -> (string)

The ID of an AWS Key Management Service (AWS KMS) customer master key (CMK) that was used to protect the encrypted file system.

ThroughputMode -> (string)

The throughput mode for a file system. There are two throughput modes to choose from for your file system: bursting and provisioned . If you set ThroughputMode to provisioned , you must also set a value for ProvisionedThroughPutInMibps . You can decrease your file system’s throughput in Provisioned Throughput mode or change between the throughput modes as long as it’s been more than 24 hours since the last decrease or throughput mode change.

ProvisionedThroughputInMibps -> (double)

The throughput, measured in MiB/s, that you want to provision for a file system. Valid values are 1-1024. Required if ThroughputMode is set to provisioned . The limit on throughput is 1024 MiB/s. You can get these limits increased by contacting AWS Support. For more information, see Amazon EFS Limits That You Can Increase in the Amazon EFS User Guide.

Tags -> (list)

The tags associated with the file system, presented as an array of Tag objects.


A tag is a key-value pair. Allowed characters are letters, white space, and numbers that can be represented in UTF-8, and the following characters:+ - = . _ : /

Key -> (string)

The tag key (String). The key can’t start with aws: .

Value -> (string)

The value of the tag key.

NextMarker -> (string)

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.