+An app lives in an App Service plan (ASP), and the App Service plan exists in a single scale unit. When an App Service is configured to be zone redundant, the platform automatically spreads the VM instances in the App Service plan across all three zones in the selected region. If a capacity larger than three is specified and the number of instances is divisible by three, the instances will be spread evenly. Otherwise, instance counts beyond 3*N will get spread across the remaining one or two zones. For App Services that aren't configured to be zone redundant, the VM instances are placed in a single zone in the selected region.
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