On 22/11/18 10:56, Jogchum Reitsma wrote: > What is the best action here? Take /dev/sdf in the initial assembly, in > stead of /dev/sdd, and re-add /dev/sdd afterwards? > Or is there a way to tell mdadm that is should treat /dev/sdd as an > active drive? Hmmm... Sorry for the delay in responding, but this is getting out of my depth :-( But yes, I think putting sdf in there should work. I don't know how to tell mdadm that sdd should be active. If you've got all the drives backed up, then fine. Actually, I think the best bet from here would be to read up on overlays - it's in the wiki - and overlay sda, sdb, sdf before re-assembling the array. That way, you're not actually going to write to the array so if it goes pear-shaped you haven't done any damage, and if it works you can just tear down the overlay (reboot, say), and then assemble for real. Cheers, Wol
