OK, so I know that this question has been asked around here (and various other places as well) but I have not yet seen a solution, nor have I seen it asked recently. So, I'm asking again for the good of humanity.
I have a DroboPro FS (B800fs) running the UNFSD DroboApp. The exports are working fine for everything but my ESXi server - there, the exported NFS volume mounts fine, but the server cannot READ the volume. It can write (create, delete, move) but cannot list directory contents. Strangest thing...
Anyway, if anyone has seen a solution to this problem, I'd love to hear it. In lieu of a fix, my next step is a work-around wherein I plug the Drobo in directly via USB into an Atom-powered Debian Linux box and do the NFS export via that.
I also have this question posted on Drobo's forums. If I get an answer there, I'll share it here.
Thanks all!