CfnFileSystem

For One Zone file systems, specify the AWS Availability Zone in which to create the file system. Use the format `us-east-1a` to specify the Availability Zone. For more information about One Zone file systems, see [EFS file system types](https://docs.aws.amazon.com/efs/latest/ug/availability-durability.html#file-system-type) in the *Amazon EFS User Guide* . > One Zone file systems are not available in all Availability Zones in AWS Regions where Amazon EFS is available.

Use the `BackupPolicy` to turn automatic backups on or off for the file system.

(Optional) A boolean that specifies whether or not to bypass the `FileSystemPolicy` lockout safety check. The lockout safety check determines whether the policy in the request will lock out, or prevent, the IAM principal that is making the request from making future `PutFileSystemPolicy` requests on this file system. Set `BypassPolicyLockoutSafetyCheck` to `True` only when you intend to prevent the IAM principal that is making the request from making subsequent `PutFileSystemPolicy` requests on this file system. The default value is `False` .

A Boolean value that, if true, creates an encrypted file system. When creating an encrypted file system, you have the option of specifying a KmsKeyId for an existing AWS KMS key . If you don't specify a KMS key , then the default KMS key for Amazon EFS , `/aws/elasticfilesystem` , is used to protect the encrypted file system.

The `FileSystemPolicy` for the EFS file system. A file system policy is an IAM resource policy used to control NFS access to an EFS file system. For more information, see [Using IAM to control NFS access to Amazon EFS](https://docs.aws.amazon.com/efs/latest/ug/iam-access-control-nfs-efs.html) in the *Amazon EFS User Guide* .

Describes the protection on the file system.

Use to create one or more tags associated with the file system. Each tag is a user-defined key-value pair. Name your file system on creation by including a `"Key":"Name","Value":"{value}"` key-value pair. Each key must be unique. For more information, see [Tagging AWS resources](https://docs.aws.amazon.com/general/latest/gr/aws_tagging.html) in the *AWS General Reference Guide* .

The ID of the AWS KMS key to be used to protect the encrypted file system. This parameter is only required if you want to use a nondefault KMS key . If this parameter is not specified, the default KMS key for Amazon EFS is used. This ID can be in one of the following formats: - Key ID - A unique identifier of the key, for example `1234abcd-12ab-34cd-56ef-1234567890ab` . - ARN - An Amazon Resource Name (ARN) for the key, for example `arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab` . - Key alias - A previously created display name for a key, for example `alias/projectKey1` . - Key alias ARN - An ARN for a key alias, for example `arn:aws:kms:us-west-2:444455556666:alias/projectKey1` . If `KmsKeyId` is specified, the `Encrypted` parameter must be set to true.

An array of `LifecyclePolicy` objects that define the file system's `LifecycleConfiguration` object. A `LifecycleConfiguration` object informs Lifecycle management of the following: - When to move files in the file system from primary storage to IA storage. - When to move files in the file system from primary storage or IA storage to Archive storage. - When to move files that are in IA or Archive storage to primary storage. > Amazon EFS requires that each `LifecyclePolicy` object have only a single transition. This means that in a request body, `LifecyclePolicies` needs to be structured as an array of `LifecyclePolicy` objects, one object for each transition, `TransitionToIA` , `TransitionToArchive` `TransitionToPrimaryStorageClass` . See the example requests in the following section for more information.

The performance mode of the file system. We recommend `generalPurpose` performance mode for all file systems. File systems using the `maxIO` performance mode can scale to higher levels of aggregate throughput and operations per second with a tradeoff of slightly higher latencies for most file operations. The performance mode can't be changed after the file system has been created. The `maxIO` mode is not supported on One Zone file systems. > Due to the higher per-operation latencies with Max I/O, we recommend using General Purpose performance mode for all file systems. Default is `generalPurpose` .

The throughput, measured in mebibytes per second (MiBps), that you want to provision for a file system that you're creating. Required if `ThroughputMode` is set to `provisioned` . Valid values are 1-3414 MiBps, with the upper limit depending on Region. To increase this limit, contact Support . For more information, see [Amazon EFS quotas that you can increase](https://docs.aws.amazon.com/efs/latest/ug/limits.html#soft-limits) in the *Amazon EFS User Guide* .

Describes the replication configuration for a specific file system.

Specifies the throughput mode for the file system. The mode can be `bursting` , `provisioned` , or `elastic` . If you set `ThroughputMode` to `provisioned` , you must also set a value for `ProvisionedThroughputInMibps` . After you create the file system, you can decrease your file system's Provisioned throughput or change between the throughput modes, with certain time restrictions. For more information, see [Specifying throughput with provisioned mode](https://docs.aws.amazon.com/efs/latest/ug/performance.html#provisioned-throughput) in the *Amazon EFS User Guide* . Default is `bursting` .