Hello @Cathal McBride
Azure Managed Disks are designed to provide high availability within an Azure Availability Zone. However, it is important to note that managed disks are tied to the specific Availability Zone (AZ) when they are created, and they cannot be directly moved into Availability Zone VM.
If you need to achieve cross-Availability Zone redundancy, you need to create copies of your managed disks in the desired Availability Zones. There are a couple of approaches you can consider:
- Create a managed disk snapshot: You can create a snapshot of the managed disk and then use that snapshot to create a new managed disk in another Availability Zone.
- Use Azure Site Recovery: Azure Site Recovery is a service that facilitates disaster recovery and migration of virtual machines between different Azure regions as well as Availability Zones.
UK south is supported for Availability zones. Hence first create a VM with managed disks in UK west and then use Azure Site Recovery to replicate your virtual machines with managed disks to an Availability Zone in UK west.
In a scenario where your VMs are deployed as single instance into a specific region, and you want to improve your availability by moving these VMs into an Availability Zone, you can do so by using Azure Site Recovery. Detailed document is here https://learn.microsoft.com/en-us/azure/site-recovery/move-azure-vms-avset-azone
https://learn.microsoft.com/en-us/azure/reliability/availability-zones-service-support
Remember that both above-specified methods might incur additional costs, so you should consider the requirements and implications of each approach based on your specific use case.
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