Tony,
Which vmhba is connected to your fabric? I assume that your tape drive is a FC tape drive and that if vmhba1 is one of your FC HBAs then it should show up under vmhba1. That is, if you are presenting the tape drive and/or the tape drive is in the same zone you may see the tape drive after a scan of the bus.
Consider employing the use of single-initiator zoning to ensure that your initiators (HBAs) only see the correct targets you want them to see.
I hope this helps.
Faisal Akber