Unable to create a managed disk with Premium SSD v2 from snapshot of disk (zonal vm eastus)

Question

I have a VM in East US with an OS and data disk. I need to migrate the data disk from Premium SSD LRS to Premium SSD V2.
To address the limitations mentioned here (https://learn.microsoft.com/en-us/azure/virtual-machines/disks-deploy-premium-v2?tabs=azure-cli#limitations), I have migrated the VM from East US zone to be a Zonal VM in East US - Zone 1 (Ref: https://learn.microsoft.com/en-us/azure/virtual-machines/move-virtual-machines-regional-zonal-portal). Now none of the limitations apply to my VM and disks.

Now to migrate successfully, I have to first create a snapshot of my data disk (https://learn.microsoft.com/en-us/azure/virtual-machines/snapshot-copy-managed-disk?tabs=portal) and then follow https://learn.microsoft.com/en-us/azure/virtual-machines/disks-convert-types?tabs=azure-portal#migrate-to-premium-ssd-v2-or-ultra-disk to create a managed disk with this snapshot.

I managed to create a snapshot, but when I try and create a managed disk, the option to migrate too Premium SSD v2 (under Change size) is greyed saying it is not supported. I am attaching all relevant screenshots below and I need help understanding why I cannot create a disk out of this snapshot.

I can confirm Subscription and Resource Group for all resources (VM, NIC for VM, Disks of VM, Snapshot of Data disk) are the same in region East US with region for VM being Zone 1.

I am attaching all relevant screenshots below.

Screenshots.pdf

Answer 1

Hi @Prateek Maini

Thank you for reaching out to the Microsoft Q&A platform.

Based on the screenshots you provided, it looks like the option to migrate to Premium SSD v2 is not available because the snapshot you created is not compatible with Premium SSD v2 disks. One possible reason for this is that the snapshot was created from a disk that is not compatible with Premium SSD v2 disks. As mentioned in the documentation, Premium SSD v2 disks have certain limitations and requirements, such as being attached to zonal VMs and having a 4k physical sector size.

If the original disk did not meet these requirements, then the snapshot created from it may not be compatible with Premium SSD v2 disks. Another possible reason is that there may be a temporary issue with the Azure portal or the Azure API that is preventing you from selecting the Premium SSD v2 option. In this case, you can try again later or use Azure CLI or PowerShell to create the managed disk. To troubleshoot this issue further, I recommend checking the properties of the original disk and the snapshot to ensure that they meet the requirements for Premium SSD v2 disks. You can also try creating a new snapshot from the original disk and then creating a managed disk from that snapshot to see if the issue persists. I hope this helps! Let me know if you have any further questions.

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