What happens if the zone a consumption functions is deployed in to goes down?

AdamWelch 20 Reputation points
2025-01-28T10:05:42.75+00:00

I have been trying to find some information that I thought I saw around consumption based functions and what happens in the event the zone that they eventually get deployed in too fails. I know we cannot determine what zone they are in and that hosts are dynamically created, but what happens if the zone, or datacenter for want of a better expression, the host is in goes down? Does Azure attempt to create a new one in one of the remaining zones? Or is it simply a case of there is no redundancy and I need to follow either the active - active/passive geo deployment models? I am looking at HA/DR patterns for this so need to understand this behaviour and the docs I have found talk mostly about the premium sku and not consumption. Thanks.

Azure Functions
Azure Functions
An Azure service that provides an event-driven serverless compute platform.
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  1. Khadeer Ali 3,030 Reputation points Microsoft Vendor
    2025-01-28T15:25:23.0233333+00:00

    @AdamWelch ,
    Welcome to Microsoft Q&A Platform!

    Thank you for your question about Azure Functions Consumption plan and zone redundancy. You're correct that the Consumption plan doesn't offer built-in support for Availability Zones. If the zone where your function is running experiences an outage, it will be temporarily unavailable.

    To achieve high availability, try considering these options:

    Azure Functions Premium Plan: This plan does support Availability Zones. It allows you to deploy your function across multiple zones within a region, providing automatic failover in case of a zone outage. This is often the best solution for zone-level redundancy.

    Geo-replication (across regions): For protection against regional outages, deploying your function in multiple regions and using Azure Traffic Manager is a good option. This is more complex but protects against broader outages.

    Which approach best depends on your specific needs and budget. The Premium plan is usually the most straightforward solution for zone redundancy.

    Hope this helps. Do let us know if you have any further queries.


    If this answers your query, do click Accept Answer and Yes for "Was this answer helpful." And if you have any further questions, let us know.

    1 person found this answer helpful.

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