# Enabling cloud write mode
<a name="cloud-write-mode"></a>

Use the `volume modify` ONTAP CLI command to enable or disable cloud write mode for an existing volume. For more information, see [https://docs.netapp.com/us-en/ontap-cli-9131/volume-modify.html](https://docs.netapp.com/us-en/ontap-cli-9131/volume-modify.html) in the NetApp ONTAP Documentation Center.

Prerequisites for setting cloud write mode are:
+ The volume must be an existing volume. You can only enable the feature on an existing volume.
+ The volume must be a read-write (RW) volume.
+ The volume must have the **All** tiering policy. For more information about modifying a volume's tiering policy, see [Updating a tiering policy](modify-volume-tiering-policy.md).

Cloud write mode is helpful for cases like migrations, for example, where large amounts of data are transferred to a file system using the NFS protocol.

**To set a volume's cloud write mode (ONTAP CLI)**

1. To access the ONTAP CLI, establish an SSH session on the management port of the Amazon FSx for NetApp ONTAP file system or SVM by running the following command. Replace `management_endpoint_ip` with the IP address of the file system's management port.

   ```
   [~]$ ssh fsxadmin@management_endpoint_ip
   ```

   For more information, see [Managing file systems with the ONTAP CLI](managing-resources-ontap-apps.md#fsxadmin-ontap-cli). 

1. Enter the ONTAP CLI advanced mode using the following command.

   ```
   FSx::> set -privilege advanced
   Warning: These advanced commands are potentially dangerous; use them only when
        directed to do so by NetApp personnel.
   Do you want to continue? {y|n}: y
   ```

1. Use the following command to set the volume’s cloud write mode, replacing the following values:
   + Replace *`svm_name`* with the name of the SVM that the volume is created on.
   + Replace *`vol_name`* with name of the volume for which you are setting cloud write mode.
   + Replace `vol_cw_mode` with either `true` to enable cloud write mode on the volume or `false` to disable it.

   ```
   FSx::> volume modify -vserver svm_name -volume vol_name -is-cloud-write-enabled vol_cw_mode
   ```

   The system responds as follows for a successful request.

   ```
   Volume modify successful on volume vol_name of Vserver svm_name.
   ```