Then /^I verify that "(.+)" device is on the "(.+)" datastore on "(.+)" esx host$/ do |device_name, ds_name, esx_host|

  device_name = $common.substitute(device_name).to_sym
  ds_name = $common.substitute(ds_name).to_sym
  esx_host = $common.substitute(esx_host).to_sym

  raise "No esx_host with name #{esx_host}" unless $esx_env.key?(esx_host)
  raise "Device not found with #{device_name} name!" unless $esx_env[esx_host].vms.key?(device_name)

  device = $esx_env[esx_host].vms[device_name]
  device_id = device.vm_id

  real_ds_name = $esx_env[esx_host].get_datastore_name_of_vm(device_name, device_id)
  real_ds_name = $common.substitute(real_ds_name).to_sym

  if real_ds_name == ds_name
    puts "Real ds name for #{device_name} is the same as provided."
  else
    raise "DS name for #{device_name} is #{real_ds_name}. Provided #{ds_name}."
  end