update vm disks in azure

az_update_vm_disk.ps1

#select sub
Select-AzSubscription -Subscription 95a20cd8-ca92-4b1e-9d7a-f9ca650b8811


# Name of the resource group that contains the VM
$rgName = 'AMS-prd'

# Choose between Standard_LRS, StandardSSD_LRS and Premium_LRS based on your scenario
$storageType = 'Premium_LRS'

#Get list of all VM's
$vmlist = Get-AzVM -ResourceGroupName $rgName


foreach ($v in $vmlist){

    #stop VM 
    Stop-AzVM -ResourceGroupName $rgName -Name $v.name -Force

    # Get all disks in the resource group of the VM
    $vmDisks = Get-AzDisk -ResourceGroupName $rgName 

    # For disks that belong to the selected VM, convert to Premium storage
    foreach ($disk in $vmDisks)
    {
        if ($disk.ManagedBy -eq $v.Id)
        {
            $disk.Sku = [Microsoft.Azure.Management.Compute.Models.DiskSku]::new($storageType)
            $disk | Update-AzDisk
        }
    }

    Start-AzVM -ResourceGroupName $rgName -Name $v.name

}