OK, so Drobo Tech Support have stated that there’s a issue with Drobo Dashboard (not the only one of course).
But this KB article take the p*ss:
I had a drive failure on my Drobo storage device that was configured for Dual Disk Redundancy. Why does Drobo Dashboard tell me it can no longer protect my data?
Answer ID 427 | Updated 05/24/2011 11:34 AM
When your Drobo device has a drive failure, Drobo Dashboard immediately goes into a relayout mode in order to protect your data. The relayout process is indicated by the drive lights blinking green and yellow. Once the relayout process completes, Drobo Dashboard indicates that your data is protected. You can tell when you have a failed drive by the drive light blinking red. This means you should remove the bad drive and replace it as soon as you can.
Depending upon the amount of data on your Drobo product, relayout can take quite a bit of time. If, during relayout, another drive should fail (two drive indicators blinking red) and you had the device in dual disk redundancy, the relayout process will take even longer.The time remaining shows up on the Status page in Drobo Dashboard. [/quote]
A complete non-answer to a legitimate question. Especially when your in the data protection “Beyond RAID” business.