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articles/iot-operations/manage-mqtt-broker/howto-disk-backed-message-buffer.md

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@@ -28,13 +28,13 @@ By default, the disk-backed message buffer feature is disabled. In this case, me
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Configuring the disk-backed message buffer is essential for maintaining a robust and reliable message queuing system, especially in scenarios where message processing speed and connectivity are critical.
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> [!NOTE]
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> The MQTT broker writes data to disk exactly as received from clients, without added encryption. Securing the disk is essential to protect the data stored by the broker.
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> The MQTT broker writes data to disk exactly as received from clients, without added encryption. Securing the disk is essential to protect the data that the broker stores.
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## Configuration options
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To configure the disk-backed message buffer, edit the `diskBackedMessageBuffer` section in the Broker resource. Currently, this configuration is supported only by using the `--broker-config-file` flag when you deploy Azure IoT Operations by using the `az iot ops create` command.
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To get started, prepare a Broker configuration file following the [DiskBackedMessageBuffer](/rest/api/iotoperations/broker/create-or-update#diskbackedmessagebuffer) API reference.
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To get started, prepare a Broker configuration file by following the [DiskBackedMessageBuffer](/rest/api/iotoperations/broker/create-or-update#diskbackedmessagebuffer) API reference.
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For example, the simplest configuration involves only specifying the maximum size. In this case, [an `emptyDir` volume](#emptydir-volume) is mounted. The `maxSize` value is used as the size limit of the `emptyDir` volume. But this option is the least preferred option because of the limitations of the `emptyDir` volume.
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### Deploy IoT Operations with disk-backed message buffer
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To use a disk-backed message buffer, deploy IoT Operations by using the `az iot ops create` command with the `--broker-config-file` flag. See the following command (other parameters are omitted for brevity):
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To use a disk-backed message buffer, deploy IoT Operations by using the `az iot ops create` command with the `--broker-config-file` flag. See the following command. (Other parameters are omitted for brevity.)
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```azurecli
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az iot ops create ... --broker-config-file <FILE>.json
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For ephemeral volume, follow the advice in the [Considerations for storage providers](#considerations-for-storage-providers) section.
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The value of the `ephemeralVolumeClaimSpec` property is used as the `ephemeral.volumeClaimTemplate.spec` property of the volume in the `StatefulSet` specs of the backend chains.
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The value of the `ephemeralVolumeClaimSpec` property is used as the `ephemeral.volumeClaimTemplate.spec` property of the volume in the `StatefulSet` specifications of the backend chains.
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For example, to use an ephemeral volume with a capacity of 1 gigabyte, specify the following parameters in your Broker resource:
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For persistent volume, follow the advice in the [Considerations for storage providers](#considerations-for-storage-providers) section.
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The value of the `persistentVolumeClaimSpec` property is used as the `volumeClaimTemplates.spec` property of the `StatefulSet` specs of the backend chains.
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The value of the `persistentVolumeClaimSpec` property is used as the `volumeClaimTemplates.spec` property of the `StatefulSet` specifications of the backend chains.
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For example, to use a persistent volume with a capacity of 1 gigabyte, specify the following parameters in your Broker resource:
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