Hey Seth,
I've encoutered the same probalem. When running "smvi discover datastores" on the Vcenter I noticed a repeating error message for all the datastores with the
same WWPN ID. I ran "fcp show adapters" on both my netapp machines, and found on one of them the portname was incorrect. even tough through "fcp portname show" it showed the correct WWPN.
I set the portname to an unused WWPN and then set the original value, and afterwards "fcp show adapters" showed the correct WWPN for the adapter portname.
Afterwards SMVI worked fine.
Roi