Was greeted with an ominous message starting up my Drobo FS backup device the other day.
A quick search on the Internet revealed a reference to this error message on a Data Robotics support page.
“A number of factors can cause your Drobo storage device to go into relayout/rebuild. During the relayout process, you will see a message indicating “Drobo cannot currently protect your data against hard drive failure.” This message tells you to take precautions. Do not turn off the power to your Drobo device during a relayout. However, you may disconnect it from your host computer, by ejecting (Mac) or Safely Removing Hardware (PC).”
Just like what could happen with a conventional RAID system, one or more of the hard drives inside my Drobo was out of sync. I let the Drobo rebuild itself and after a few hours, all was well again.