Same problem here. Not showing any Snapmirror data no mater if I point STM to DFM or straight to the NetApp. Even using linux for the agent. No NFS shares show up either.
The SnapMirror monitoring relies on the presence of the snapmirror.conf file in /etc. itreads the relationships and schedules from here. This file is not used if you manage your relationships through Operations Manager or even use OCSM, apparently, to set up the snaps. I am considering just setting one up with the relationships and a null schedule for each, but just want to make sure there is not a better way, and also that it does not hurt my current relationships as use DPM and Commvaukt Simpana and Simpana is finicky about snapmirrors being set up just right.