Azure service availability

Question

The mentioned link states 3 types of services ":

https://learn.microsoft.com/en-us/azure/availability-zones/az-region

Zonal services: A resource can be deployed to a specific, self-selected availability zone to achieve more stringent latency or performance requirements. Resiliency is self-architected by replicating applications and data to one or more zones within the region. Resources can be pinned to a specific zone. For example, virtual machines, managed disks, or standard IP addresses can be pinned to a specific zone, which allows for increased resiliency by having one or more instances of resources spread across zones.

Zone-redundant services: Resources are replicated or distributed across zones automatically. For example, zone-redundant services replicate the data across three zones so that a failure in one zone doesn't affect the high availability of the data. 

Always-available services: Always available across all Azure geographies and are resilient to zone-wide outages and region-wide outages. For a complete list of always-available services, also called non-regional services, in Azure, see Products available by region.

In this case it shows Application gateway V2 both as Zonal services and Zone-redundant services and so forth. In this case do we understand that if zone is selected at the time of creation of Application gateway V2 , it is Zonal service else Zone-redundant services

Answer 1

Hi @Vishal Garg ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are trying to configure Availability Zone(s) for Application Gateway v2.

If you configure a particular Zone, then the resource is pinned to that particular Zone.
This makes the resource a Zonal Service.

In case you select multiple Zones, the resource is distributed across those zones.
This makes the resource a Zone-redundant service.

However, if you select "None", no zonal guarantee is provided for the resource.
In the backend, the resource will get deployed in any one of our Zones, but users will not have any control over it
i.e, The resource does not have the concept of "Zones".

Cheers,
Kapil

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