In a zone-redundant App Service Environment, your apps are distributed across the maximum number of available zones, up to three, within the same region. Zone redundancy is available in regions that support availability zones. With this deployment type, your App Service plan must include at least two instances to ensure redundancy across zones. You can scale up App Service plans by adding one or more instances at a time. Scaling doesn't have to be in units of two or three. However, the app is only balanced across all availability zones when the total number of instances are multiples of two or three, depending on the number of available zones. To view the number of available zones for your App Service Environment, see the *Maximum available zones* property in the **Configuration** blade of the Azure portal. If the value is two or three, your App Service Environment is zone redundant.
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