Well things went from bad to terrible with 3.0 dashboard. The Drobo Dashboard 3.0.0 on my Mac mini refused to find the attached Drobo (4 bay Gen 3) even though the volumes were mounted on the Mac. Also the Drobo drive icons were missing - just the default Mac ones instead. And on top of that, the Mac was very unresponsive (direct access, not using screen sharing) and the Drobo backup volume was showing errors that the Mac Disk Utility could not fix.
I tried installing the 3.0.0 dashboard on my MacBook Pro and connecting the Drobo to the Mackbook Pro. Same issue.
I then tried the same connecting the Drobo to a Windows 10 laptop with the 3.0.0 dashboard. On windows, the 3.0.0 dashboard was able to discover the Drobo but as the volumes are formatted for Mac, is was not, of course, able to mount them.
So I have reverted to 2.8.1 - all my problems go away with that version.
If I had to guess - The part of the 3.0.0 dashboard that probes to find an attached Drobo was the cause of the issue, that would explain both the fact the dashboard could not find the Drobo, and, perhaps how the dashboard could cause disk issues?
Drobo is firmware version 3.5.4 [11.50.86645]