Azure is continually expanding the number of services that support availability zones, including zonal and zone-redundant offerings.
Types of availability zone support
Azure services can provide two types of availability zone support: zonal and zone-redundant. Each service supports either one or both types. When designing your reliability strategy, make sure that you understand which availability zone types are supported in each service of your workload.
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 are aligned to a selected zone. For example, virtual machines, managed disks, or standard IP addresses can be aligned to a same zone, which allows for increased resiliency by having multiple instances of resources deployed to different zones.
Zone-redundant services: Resources are replicated or distributed across zones automatically. For example, zone-redundant services replicate the data across multiple zones so that a failure in one zone doesn't affect the high availability of the data.
Important
Some services may have limited support for availability zones. For example, some may only support availability zones for certain tiers, regions, or SKUs. To get more information on service limitations for availability zone support, select that service in the table.
Always-available services
Some Azure services don't support availability zones because they are:
Available across multiple Azure regions within a geographic area, or even across all Azure regions globally.
Resilient to zone-wide outages.
Resilient to region-wide outages.
For a complete list of always-available services, also called non-regional services, in Azure, see Products available by region.
The following tables provide a summary of the current offering of zonal, zone-redundant, and always-available Azure services. They list Azure offerings according to the regional availability of each.
Important
To learn more about availability zones support and available services in your region, contact your Microsoft sales or customer representative.
Legend
In the Product Catalog, always-available services are listed as "non-regional" services.
Azure offerings are grouped into three categories that reflect their regional availability: foundational, mainstream, and strategic services. Azure's general policy on deploying services into any given region is primarily driven by region type, service category, and customer demand. For more information, see Azure services.
Foundational services: Available in all recommended and alternate regions when a region is generally available, or within 90 days of a new foundational service becoming generally available.
Mainstream services: Available in all recommended regions within 90 days of a region's general availability. Mainstream services are demand-driven in alternate regions, and many are already deployed into a large subset of alternate regions.
Strategic services: Targeted service offerings, often industry-focused or backed by customized hardware. Strategic services are demand-driven for availability across regions, and many are already deployed into a large subset of recommended regions
Important
Some services, although they are zone-redundant, may have limited support for availability zones. For example, some may only support availability zones for certain tiers, regions, or SKUs. To get more information on service limitations for availability zone support, select that service in the following table.
Administer an SQL Server database infrastructure for cloud, on-premises and hybrid relational databases using the Microsoft PaaS relational database offerings.