I’ve been researching this problem but haven’t found a solution that has worked.
My Gen3 Drobo w/ 4 WD drives won’t mount after upgrading macOS. I upgraded to Capitan and then, to Sierra.
I’ve shut down and rebooted drobos and macs. I’ve tried to repair drives. Disk Utility shows a greyed out Drobo drive that doesn’t respond to commands to mount or first aid.
I tried my MacBookPro and Drobo won’t mount there either.
Drobo Dashboard recognizes the connected Drobo and tells me all is peachy keen. All firmware is up to date.
If you have any ideas, I’m all ears. Thanks in advance.