Hi..
Remember that you have to configure que LTO tape drives in a Fabric Port, this is the correct manner to do that.
In the library you have to enter in the menu, in the opcion "configuration", later "device configuraion" and select each tape drive that appears here. in each drive you have to select de configuration for de wwn adrress if is FC, if the tape drive is SCSI you have to select de SCSI ID configuration. If is SCSI you have to put de id "126" and the drive log on in the switch as a "Fabric Port", if is FC you have to select hard adrress "disabled". This is because the tape drives have to logon into a SAN.