I have a Drobo Gen 2 with 4 WD 1TB drives inserted.
I’ve been using it attached to my Netgear Router via USB.
A couple of days ago, it disappeared.
I connected it directly to my Macbook Pro running 10.11.5 (El Capitan).
The Drobo Dashboard sees the box, but when I click on it, a pop up notifier says there is a new volume that needs to be formatted. I have not inserted or removed any drives. There’s no reason for a drive to need formatting. The Dashboard also says that I am using 1.85TB, I have 2.71TB free of a total 2.71TB. Huh? That math doesn’t add up.
In Disk Utility, Drobo shows up in the sidebar but it is greyed out. When I click First Aid, it fails and says: Invalid Node Structure. Operation Failed.
I’m spent a few hours reading over various posts on the Internet, but haven’t made any progress.
I also connected the Drobo to my wife’s Mac running OSX 10.9.5, but it has the same issues. I’ve tried multiple USB cables and ports.
The lights next to the drives on the Drobo are green, the power light is green, and the 7 of the 10 blue lights are light. When I restart the Drobo, it goes through a normal boot sequence.
I think I’m at the point where my only option is to purchase Disk Warrior. There’s vital info on the Drobo that I need to recover.
Any suggestions are appreciated.