I’m having the same issue as of a couple of days ago. My drobo had 5 x 4 TB WD Red drives. The drobo was down to 15% free space, and I was told to replace it with a drive of larger capacity.
I replaced it with a 6 TB WD Red drive, and after 30 hours or so, the drobo rebuilt itself, but drobo dashboard reports that this new drive is an SSD.
Again the drobo failed out another drive, telling me that I needed to put in a larger drive. There was still about 15% free space. I copied about 250GB of data off the drobo, and it stopped complaining about the lack of space.
However, performance on the drobo now terribly degraded. Is this problem related to the dashboard insisting that one of the drive is an SSD? The drobo has 15% (2.45 TB) of free space.
I purchased another 6 TB WD Red, but don’t know if this will also be mis-reported as an SSD, and if this will make the problem worse, or will result in data loss.
Should I remove and re-insert the false SSL drive?
My Drobo is out of warranty, so there’s no assistance from Drobo corp at all.