Mithun Shanbhag

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High Availability in Azure: Availability Zones

Published on 31 Mar 2019 by Mithun Shanbhag

Note: This blog post is part of a series centered around the topic of high availability in Azure:

I’ll not be addressing scaling (horizontal or vertical), backups/restores and resiliency/healing in these posts. Each of those topics deserve their own series, perhaps I’ll write about them in the future if time permits.

Azure Availability Zones

azure availability zones

In the opening post of this blog series we talked about availability zones and how resources can be classified as zone-redundant, zonal (zone-specific) or non-zonal (regional). If you haven’t seen that post, please take a minute to do so.

Availability zones exist to shield your resources against a datacenter-level disaster.

As of the time of writing this blog post, only a few Azure regions support availability zones.

Availability zones are free (you’re only charged for the VMs and resources placed in the availability zones).

Supported Azure Resources

Only a few Azure resource types support availability zones (we’re highlighting a couple of important ones below. The complete list is available here).

Availability Sets vs Availability Zones

[image attribution: Azure documentation] availability zone vs availability set

Caveats, restrictions, gotchas & tidbits

That’s all for today folks! Comments? Suggestions? Thoughts? Would love to hear from you, please leave a comment below or send me a tweet.