Why are so many VM sizes unavailable in West US 2 Availability Zones 2 and 3?

Question

West US 2 is an Azure recommended region, yet all of the most common VM types and sizes are not available in West US 2 Availability Zones 2 and 3. I'm trying to add redundancy to my VMs but I can't because 80% of the VM types aren't available in Zones 2 and 3.

How are people supposed to build redundant services with Azure if all of the most commonly used VMs are unavailable? Do I need to request access to these?

Answer 1

Hi Andrew,

The limited availability of VM types in Zones 2 and 3 can indeed be due to computing resource constraints as the same VM size SKU may not be available in all availability zones within a region. https://learn.microsoft.com/en-us/azure/azure-resource-manager/troubleshooting/error-sku-not-available?tabs=azure-cli

To determine which SKUs are available in a location or zone, use the az vm list-skus command. https://learn.microsoft.com/en-us/cli/azure/vm?view=azure-cli-latest#az-vm-list-skus

If a SKU isn't available for your subscription in a location or zone that meets your business needs, submit a SKU request to Azure Support.

Check for alternative VM sizes that are supported across all three zones (1, 2, 3) in your region.

Try to check with below documentation for high availability with Azure virtual machines and managed disks

https://learn.microsoft.com/en-us/azure/virtual-machines/disks-high-availability?source=recommendations

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