While looking around the Drobo control panel for my B800i, I clicked on the little "X" in the Mount column by one of the volumes by accident.
I pulled this image off the Internet and it is not my setup.
Drobo thinks it isn't formatted (it actually has a lot of important data on it, but it's managed by Xen, and apparently Drobo doesn't know about that file system). Therefore, it asked me to create a file system and suggested NTFS. I hit Cancel in that dialog, since I didn't want to do that. Even so, after the dialog went away, the little X became a spinning icon. Nothing seemed to happen, so I closed the Drobo Dashboard application after a brief moment.
Later, I noticed some slowness while working with a Drobo volume from a Windows VM on the Xen server, but that might be normal/unrelated. Did I do something terrible to my Drobo volume? What does the spinning icon in the Mount column mean?