On 08/18/2017 12:35 PM, Mr Typo wrote: > mdadm: /dev/sda1 is busy - skipping > mdadm: /dev/sdb1 is busy - skipping > mdadm: /dev/sdc1 is busy - skipping > mdadm: /dev/sdd1 is busy - skipping That's plenty strange. The output of "lsblk" might tell you why those devices are busy.