I plan to keep it updated, but I feel like I've reached the end of the line with this array. I'm almost certain I have to rebuild.

I agree that Drobo is in a class of its own. The supposed features are untouchable. The only thing that comes close is unRAID, but that's not nearly as elegant.

We have a Drobo Pro at work by the way. I'm really rethinking that decision now, but it's given us no issues.