My Drobo 5N is at 48% capacity with Dual Disk Redundancy turned off. I’m considering enabling Dual Disk Redundancy, but the option is greyed-out. Is it based on capacity levels? The Capacity Calculator suggests I have enough free space to enable Dual Disk Redundancy, but not by much.
Thanx!
well you haven’t told us anything about what drives you have etc etc
if you only have 2 disks… you cant turn on dual disk redundancy, etc…
you say “not by much”… it needs a certain % to be free AFTER enabling it…
In closing, I replaced a 750GB drive with a 3TB drive and the Dual Disk Redundancy feature was again selectable…which I did. Guess it knows what it’s doing. 
goodo