I managed to configure the mail iscsi domain for my ovirt 4.1 engine and node , it connects to the storage initially and initialises the data center ,but after rebooting the node and engine , it creates unecessary vg and lvs like below

280246d3-ac7b-44ff-8c03-dc2bcb9edb70 d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a----- 128.00m                                                   
  2d57ab88-16e4-4007-9047-55fc4a35b534 d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a----- 128.00m                                                   
  ids                                  d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a----- 128.00m                                                   
  inbox                                d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a----- 128.00m                                                   
  leases                               d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a-----   2.00g                                                   
  master                               d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a-----   1.00g                                                   
  metadata                             d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a----- 512.00m                                                   
  outbox                               d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a----- 128.00m                                                   
  xleases                              d5104206-5863-4f9d-9ea7-2b140c97d65f -wi-a-----   1.00g