Same problem. Walked into the office to find our 5N with the single red light on. The dashboard app just says “Add a drive”, while there were four WD Red Pro disks installed with at least 6TB of free space.
After rebooting, all four drives started blinking green and orange, and the dashboard app said “Data protection in progress”. The next day, all bays were orange, and the power indicator was completely off. The Drobo and the disks inside were making noise, but didn’t show up in the dashboard and I couldn’t ping it from my Mac’s terminal. After manually rebooting the machine again, I could acces my Drobo again. Three disks were green, but one showed a red light and indicated it had failed
I didn’t have a spare one ready, so quickly ordered a new 14TB WD Red Pro.
But when I replaced it, the Drobo didn’t recognize the new disk. It just kept showing as empty. I tried another empty slot, but also no luck.
Then I tried to reboot it again, but now it either shows up completely empty in my dashboard like before, or it doesn’t show up at all. Again without a light on the power indicator, but orange lights next to all bay doors. I really can’t tell if this is a hardware failure or firmware.
Has anybody had any succes in fixing this issue?
Besides all this, I find it annoying that Drobo’s customer support and warranty are so limited. WD gives 5 years of warranty on their disks, but Drobo after two years, Drobo lets its customers pay to ask a few questions.