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* <p>This operation accepts an optional <code>PerformanceMode</code> parameter that you choose
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* for your file system. We recommend <code>generalPurpose</code> performance mode for all file
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* systems. File systems using the <code>maxIO</code> mode is a previous generation performance type that is designed for highly parallelized workloads that can tolerate higher latencies
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* than the General Purpose mode. Max I/O mode is not supported for One Zone file systems or
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* for your file system. We recommend <code>generalPurpose</code>
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* <code>PerformanceMode</code> for all file
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* systems. The <code>maxIO</code> mode is a previous generation performance type that is designed for highly parallelized workloads that can tolerate higher latencies
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* than the <code>generalPurpose</code> mode. <code>MaxIO</code> mode is not supported for One Zone file systems or
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* file systems that use Elastic throughput.</p>
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* <important>
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* <p>Due to the higher per-operation latencies with Max I/O, we recommend using General Purpose performance mode for all file systems.</p>
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* </important>
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* <p>The performance mode can't be changed after
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* the file system has been created. For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/performance.html#performancemodes.html">Amazon EFS performance
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* <p>The <code>PerformanceMode</code> can't be changed after the file system has been
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* created. For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/performance.html#performancemodes.html">Amazon EFS performance
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* modes</a>.</p>
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* <p>You can set the throughput mode for the file system using the <code>ThroughputMode</code> parameter.</p>
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* <p>You can set the throughput mode for the file system using the <code>ThroughputMode</code>
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* parameter.</p>
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* <p>After the file system is fully created, Amazon EFS sets its lifecycle state to
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* <code>available</code>, at which point you can create one or more mount targets for the file
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* system in your VPC. For more information, see <a>CreateMountTarget</a>. You mount your Amazon EFS file system on an EC2 instances in
* <p>Creates a replication configuration that replicates an existing EFS file system
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* to a new, read-only file system. For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/efs-replication.html">Amazon EFS replication</a> in the
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* <i>Amazon EFS User Guide</i>. The replication configuration
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* specifies the following:</p>
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* <p>Creates a replication configuration to either a new or existing EFS file system.
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* For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/efs-replication.html">Amazon EFS replication</a> in the <i>Amazon EFS User
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* Guide</i>. The replication configuration specifies the following:</p>
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* <ul>
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* <li>
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* <p>
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* <b>Source file system</b> – The EFS file system that
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* you want replicated. The source file system cannot be a destination file system in an
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* existing replication configuration.</p>
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* <b>Source file system</b> – The EFS file
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* system that you want to replicate. </p>
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* </li>
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* <li>
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* <p>
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* <b>Amazon Web Services Region</b> – The Amazon Web Services Region in which the destination file system is created. Amazon EFS
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* replication is available in all Amazon Web Services Regions in which EFS is available. The
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* Region must be enabled. For more information, see <a href="https://docs.aws.amazon.com/general/latest/gr/rande-manage.html#rande-manage-enable">Managing Amazon Web Services Regions</a> in the <i>Amazon Web Services General Reference
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* Reference Guide</i>.</p>
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* </li>
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* <li>
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* <p>
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* <b>Destination file system configuration</b> – The
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* configuration of the destination file system to which the source file system will be
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* replicated. There can only be one destination file system in a replication configuration. </p>
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* <p>Parameters for the replication configuration include:</p>
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* <ul>
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* <li>
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* <p>
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* <b>File system ID</b> – The ID of the destination
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* file system for the replication. If no ID is provided, then EFS creates a new file
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* system with the default settings. For existing file systems, the file system's
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* replication overwrite protection must be disabled. For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/efs-replication#replicate-existing-destination"> Replicating to
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* an existing file system</a>.</p>
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* </li>
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* <li>
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* <p>
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* <b>Availability Zone</b> – If you want the destination file
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* system to use One Zone storage, you must specify the Availability Zone to create the
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* file system in. For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/storage-classes.html">
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* EFS file system types</a> in the <i>Amazon EFS User
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* Guide</i>.</p>
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* </li>
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* <li>
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* <p>
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* <b>Encryption</b> – All destination file systems are created
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* with encryption at rest enabled. You can specify the Key Management Service (KMS) key that is used to encrypt the destination file system. If you don't
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* specify a KMS key, your service-managed KMS key for
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* Amazon EFS is used. </p>
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* <note>
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* <p>After the file system is created, you cannot change the KMS key.</p>
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* </note>
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* </li>
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* </ul>
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* </li>
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* </ul>
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* <note>
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* <p>After the file system is created, you cannot change the KMS key.</p>
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* </note>
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* <p>For new destination file systems, the following properties are set by default:</p>
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* <ul>
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* <li>
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* <p>
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* <b>Performance mode</b> - The destination file system's
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* performance mode matches that of the source file system, unless the destination file
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* system uses EFS One Zone storage. In that case, the General Purpose performance mode is
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* used. The performance mode cannot be changed.</p>
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* </li>
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* <li>
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* <p>
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* <b>Throughput mode</b> - The destination file system's
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* throughput mode matches that of the source file system. After the file system is created,
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* you can modify the throughput mode.</p>
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* </li>
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* </ul>
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* <ul>
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* <li>
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* <p>
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* <b>Lifecycle management</b> – Lifecycle management is not enabled
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* on the destination file system. After the destination file system is created, you can
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* enable lifecycle management.</p>
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* </li>
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* <li>
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* <p>
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* <b>Automatic backups</b> – Automatic daily backups are enabled on
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* the destination file system. After the file system is created, you can change this
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* setting.</p>
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* <b>Destination file system</b> – The destination file
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* system to which the source file system is replicated. There can only be one destination
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* file system in a replication configuration. </p>
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* <note>
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* <p>A file system can be part of only one replication configuration. </p>
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* </note>
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* <p>The destination parameters for the replication configuration depend on
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* whether you are replicating to a new file system or to an existing file system, and if you
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* are replicating across Amazon Web Services accounts. See <a>DestinationToCreate</a> for more information.</p>
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* </li>
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* </ul>
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* <p>For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/efs-replication.html">Amazon EFS replication</a> in the
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* <i>Amazon EFS User Guide</i>.</p>
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* <p>This operation requires permissions for the <code>elasticfilesystem:CreateReplicationConfiguration</code>
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* action. Additionally, other permissions are required depending on how you are replicating file systems.
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* For more information, see <a href="https://docs.aws.amazon.com/efs/latest/ug/efs-replication.html#efs-replication-permissions">Required permissions for replication</a>
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* in the <i>Amazon EFS User
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* Guide</i>.</p>
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* @example
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* Use a bare-bones client and the command you need to make an API call.
* exactly one file system policy, which can be the default policy or an explicit policy set or
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* updated using this API operation. EFS file system policies have a 20,000 character
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* limit. When an explicit policy is set, it overrides the default policy. For more information
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* about the default file system policy, see <a href="https://docs.aws.amazon.com/efs/latest/ug/iam-access-control-nfs-efs.html#default-filesystempolicy">Default EFS
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* File System Policy</a>. </p>
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* about the default file system policy, see <a href="https://docs.aws.amazon.com/efs/latest/ug/iam-access-control-nfs-efs.html#default-filesystempolicy">
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* Default EFS file system policy</a>. </p>
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* <note>
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* <p>EFS file system policies have a 20,000 character limit.</p>
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