After an initial deployment, you might run into the need of changing the initial disk performance SKU in Azure. In the example below, we’re updating the SKU from Standard_LRS to Premium_LRS. In your PowerShell session type:

New-AzDiskUpdateConfig -Sku Premium_LRS | Update-AzDisk -ResourceGroupName yourresourcegroup -Name yourdiskname

It comes helpful to know how to update the size of a newly created disk in Azure. So, in your PowerShell session type:

New-AzDiskUpdateConfig -DiskSizeGB 64 | Update-AzDisk -ResourceGroupName yourresourcegroup -DiskName thenameofyourdisk

Verify:

Get-AzDisk -ResourceGroupName yourresourcegroup -Name thenameofyourdisk