IoT Hub Device Provisioning Service high availability and disaster recovery
Device Provisioning Service (DPS) is a helper service for IoT Hub that enables zero-touch device provisioning at-scale. DPS is an important part of your IoT solution. This article describes the High Availability (HA) and Disaster Recovery (DR) capabilities that DPS provides. To learn more about how to achieve HA-DR across your entire IoT solution, see Disaster recovery and high availability for Azure applications. To learn about HA-DR in IoT Hub, see IoT Hub high availability and disaster recovery.
DPS also supports Availability Zones. An Availability Zone is a high-availability offering that protects your applications and data from datacenter failures. A region with Availability Zone support is comprised of a minimum of three zones supporting that region. Each zone provides one or more datacenters, each in a unique physical location with independent power, cooling, and networking. This provides replication and redundancy within the region. Availability Zone support for DPS is enabled automatically for DPS resources in the following Azure regions:
- Australia East
- Brazil South
- Canada Central
- Central US
- East US
- East US 2
- France Central
- Japan East
- North Europe
- UK South
- West Europe
- West US 2
You don't need to take any action to use availability zones in supported regions. Your DPS instances are AZ-enabled by default. It's recommended that you leverage Availability Zones by using regions where they are supported.
Disaster recovery and Microsoft-initiated failover
DPS leverages paired regions to enable automatic failover. Microsoft-initiated failover is exercised by Microsoft in rare situations when an entire region goes down to failover all the DPS instances from the affected region to its corresponding paired region. This process is a default option and requires no intervention from the user. Microsoft reserves the right to make a determination of when this option will be exercised. This mechanism doesn't involve user consent before the user's DPS instance is failed over.
The only users who are able to opt-out of this feature are those deploying to the Brazil South and Southeast Asia (Singapore) regions.
Azure IoT Hub Device Provisioning Service doesn't store or process customer data outside of the geography where you deploy the service instance. For more information, see Cross-region replication in Azure.
Disable disaster recovery
By default, DPS provides automatic failover by replicating data to the paired region for a DPS instance. For some regions, you can avoid data replication outside of the region by disabling disaster recovery when creating a DPS instance. The following regions support this feature:
- Brazil South; paired region, South Central US.
- Southeast Asia (Singapore); paired region, East Asia (Hong Kong).
To disable disaster recovery in supported regions, make sure that Disaster recovery enabled is unselected when you create your DPS instance:
You can also disable disaster recovery when you create a DPS instance using an ARM template.
Failover capability will not be available if you disable disaster recovery for a DPS instance.
You can check whether disaster recovery is disabled from the Overview page of your DPS instance in Azure portal:
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