If the Geo Region selected for Function App plan is zone redundant, then is the zone redundancy enabled by default ?

Question

If the Geo Region selected for Function App plan is zone redundant, then is the zone redundancy enabled by default ?

Answer 1

Hello Kaushik Nalla

No, zone redundancy is not automatically enabled for a Function App plan even if the Geo Region selected is zone-redundant.

Here's why:

• Azure Functions Pricing Tiers: Azure Functions offer various pricing tiers, each with different levels of redundancy and scalability options. The most basic tier, the Consumption plan, does not include zone redundancy by default.
• Explicit Configuration: To enable zone redundancy for your Function App, you need to explicitly configure it during the plan creation process. Azure provides options for choosing zone-redundant plans within specific pricing tiers that support this feature.

In summary:

• Zone redundancy is a configuration option for Function App plans within certain pricing tiers.
• Selecting a zone-redundant Geo Region does not automatically activate zone redundancy for your Function App.

Here are some additional points to consider:

• Zone Redundant vs. Zonal Deployment: Zone redundancy distributes your function app instances across multiple availability zones within the region, ensuring high availability even if a zone experiences an outage. Zonal deployment pins your function app instances to a specific zone.
• Pricing Implications: Zone-redundant plans typically come at a higher cost compared to non-redundant plans.

**When choosing a Function App plan, carefully evaluate your redundancy and scalability requirements to select the most appropriate option.**No, zone redundancy is not automatically enabled for a Function App plan even if the Geo Region selected is zone-redundant.

Here's why:

• Azure Functions Pricing Tiers: Azure Functions offer various pricing tiers, each with different levels of redundancy and scalability options. The most basic tier, the Consumption plan, does not include zone redundancy by default.
• Explicit Configuration: To enable zone redundancy for your Function App, you need to explicitly configure it during the plan creation process. Azure provides options for choosing zone-redundant plans within specific pricing tiers that support this feature.

In summary:

• Zone redundancy is a configuration option for Function App plans within certain pricing tiers.
• Selecting a zone-redundant Geo Region does not automatically activate zone redundancy for your Function App.

Here are some additional points to consider:

• Zone Redundant vs. Zonal Deployment: Zone redundancy distributes your function app instances across multiple availability zones within the region, ensuring high availability even if a zone experiences an outage. Zonal deployment pins your function app instances to a specific zone.
• Pricing Implications: Zone-redundant plans typically come at a higher cost compared to non-redundant plans.

When choosing a Function App plan, carefully evaluate your redundancy and scalability requirements to select the most appropriate option.

Answer 2

@Kaushik Nalla Thanks for reaching out.

Summarizing innovative response. If you select a Geo Region that supports zone redundancy for your Function App plan, then zone redundancy is not enabled by default. You need to create a zone-redundant plan and deploy your function app to that plan. After the zone-redundant plan is created and deployed, any function app hosted on your new plan is considered zone-redundant

For more information on function reliability, you can refer to this document.