AWS SDK Version 3 for .NET
API Reference

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Creates a new, empty file system. The operation requires a creation token in the request that Amazon EFS uses to ensure idempotent creation (calling the operation with same creation token has no effect). If a file system does not currently exist that is owned by the caller's Amazon Web Services account with the specified creation token, this operation does the following:

Otherwise, this operation returns a FileSystemAlreadyExists error with the ID of the existing file system.

For basic use cases, you can use a randomly generated UUID for the creation token.

The idempotent operation allows you to retry a CreateFileSystem call without risk of creating an extra file system. This can happen when an initial call fails in a way that leaves it uncertain whether or not a file system was actually created. An example might be that a transport level timeout occurred or your connection was reset. As long as you use the same creation token, if the initial call had succeeded in creating a file system, the client can learn of its existence from the FileSystemAlreadyExists error.

For more information, see Creating a file system in the Amazon EFS User Guide.

The CreateFileSystem call returns while the file system's lifecycle state is still creating. You can check the file system creation status by calling the DescribeFileSystems operation, which among other things returns the file system state.

This operation accepts an optional PerformanceMode parameter that you choose for your file system. We recommend generalPurpose performance mode for all file systems. File systems using the maxIO mode is a previous generation performance type that is designed for highly parallelized workloads that can tolerate higher latencies than the General Purpose mode. Max I/O mode is not supported for One Zone file systems or file systems that use Elastic throughput.

Due to the higher per-operation latencies with Max I/O, we recommend using General Purpose performance mode for all file systems.

The performance mode can't be changed after the file system has been created. For more information, see Amazon EFS performance modes.

You can set the throughput mode for the file system using the ThroughputMode parameter.

After the file system is fully created, Amazon EFS sets its lifecycle state to available, at which point you can create one or more mount targets for the file system in your VPC. For more information, see CreateMountTarget. You mount your Amazon EFS file system on an EC2 instances in your VPC by using the mount target. For more information, see Amazon EFS: How it Works.

This operation requires permissions for the elasticfilesystem:CreateFileSystem action.

File systems can be tagged on creation. If tags are specified in the creation action, IAM performs additional authorization on the elasticfilesystem:TagResource action to verify if users have permissions to create tags. Therefore, you must grant explicit permissions to use the elasticfilesystem:TagResource action. For more information, see Granting permissions to tag resources during creation.

Note:

This is an asynchronous operation using the standard naming convention for .NET 4.5 or higher. For .NET 3.5 the operation is implemented as a pair of methods using the standard naming convention of BeginCreateFileSystem and EndCreateFileSystem.

Namespace: Amazon.ElasticFileSystem
Assembly: AWSSDK.ElasticFileSystem.dll
Version: 3.x.y.z

Syntax

C#
public abstract Task<CreateFileSystemResponse> CreateFileSystemAsync(
         CreateFileSystemRequest request,
         CancellationToken cancellationToken
)

Parameters

request
Type: Amazon.ElasticFileSystem.Model.CreateFileSystemRequest

Container for the necessary parameters to execute the CreateFileSystem service method.

cancellationToken
Type: System.Threading.CancellationToken

A cancellation token that can be used by other objects or threads to receive notice of cancellation.

Return Value


The response from the CreateFileSystem service method, as returned by ElasticFileSystem.

Exceptions

ExceptionCondition
BadRequestException Returned if the request is malformed or contains an error such as an invalid parameter value or a missing required parameter.
FileSystemAlreadyExistsException Returned if the file system you are trying to create already exists, with the creation token you provided.
FileSystemLimitExceededException Returned if the Amazon Web Services account has already created the maximum number of file systems allowed per account.
InsufficientThroughputCapacityException Returned if there's not enough capacity to provision additional throughput. This value might be returned when you try to create a file system in provisioned throughput mode, when you attempt to increase the provisioned throughput of an existing file system, or when you attempt to change an existing file system from Bursting Throughput to Provisioned Throughput mode. Try again later.
InternalServerErrorException Returned if an error occurred on the server side.
ThroughputLimitExceededException Returned if the throughput mode or amount of provisioned throughput can't be changed because the throughput limit of 1024 MiB/s has been reached.
UnsupportedAvailabilityZoneException Returned if the requested Amazon EFS functionality is not available in the specified Availability Zone.

Version Information

.NET Core App:
Supported in: 3.1

.NET Standard:
Supported in: 2.0

.NET Framework:
Supported in: 4.5

See Also