Please post what is in the /proc/scsi/qlogic.
If you perform a dmesg, what the entries are listed referring to the qlogic? Are there any tape devices listed in /dev (nstx)?
One thing to do is to install qlogic hba management software (java app). If you do not see the tape devices,within the app, you most likely have a zoning issue. If you can see the tape devices within that application, that means the qlogic hba "sees" the tape devices. If the qlogic see the tape devices and you have nstx devices, you should be good. The robotics usually are picked up by /dev/sg (if I remember correctly) or the backup app takes care of it.