An administrator is trying to diagnose as to why a new VIO client （vio_client1） cannot see an allocated disk （hdisk4） from a VIO server （VIOS-A）. The client virtual SCSI adapter has a slot ID of 5 and the corresponding VIO server virtual SCSI adapter has a slot ID of 3. The administrator checks the virtual SCSI configuration from the HMC using the following lshwres command.
 lshwres –r virtualio --rsubtype scsi -m 9117-570*65ABCDE 
--level lpar -F \ lpar_name，slot_num，remote_lpar_name，remote_slot_num，backing_device VIOS A，5，vio_client2，2，hdisk3 VIOS-A，4，vio_client1，4，hdisk4 VIOS-A，3，vio_client1，6，hdisk5 VIOS-A，2，vio_client3，2，hdisk6 vio_client2，2，VIOS-A，5，hdisk0 vio_client1，4，VIOS-A，4，hdisk0 
vio_client1，5，VIOS-A，3，null vio_client3，2，VIOS-A，2，hdisk0 From the output above， 
what is the most likely reason why the client cannot see the mapped storage？（）