Azure VMSS 10 model limit?

Question

Recently when I update my VMSS model, I received error like

MyVmssName has reached its limit of 10 models that may be referenced by one or more VMs belonging to the Virtual Machine Scale Set. . Upgrade the VMs to the latest model of the Virtual Machine Scale Set before trying again.

Does Azure have some official documentation on this 10 model limitation? Could not find it anywhere.

@Imran the above quote is exactly the error I got in Azure Portal. — Yu Lan, Jan 05 '23 at 04:13

score 0 · Answer 1 · answered Jan 06 '23 at 09:13

I have referred similar Issue:

When a change is made to the VMSS, such as a cluster upgrade, the change must be applied to the existing instances.

If VMSS using the manual upgrade policy. This means that when a change is made, the user must manually update the old instances.

Azure Portal > Impacted VMSS > Instances tab.

The CX can then select each instance which is showing Latest Model as No and upgrade one by one. I would not recommend upgrading all instances at once as this may bring the VMSS down.

enter image description here

Also upgrade VMSS instances using Azure CLI.

enter image description here

if VMSS upgrade policy is set to automatic, instances will upgrade automatically in random order.

enter image description here

You can also upgrade VMSS using Azure CLI.

az vmss update --name <VMSSName> --resource-group <ResourceGroupname> --license-type windows_server

enter image description here

Reference: Update VMSS

Azure VMSS 10 model limit?

1 Answers1