--On Friday, September 18, 2020 10:53 PM +0200 Simon Matter <simon.matter at invoca.ch> wrote: > mdadm --remove /dev/md127 /dev/sdf1 > > and then the same with --add should hotremove and add dev device again. > > If it rebuilds fine it may again work for a long time. Thanks. That reminds me: If I need to replace it, is there some easy way to figure out which drive bay is sdf? It's an old Supermicro rack chassis with 6 drive bays. Perhaps a way to blink the drive light?