$mdadm --assemble --scan -v
mdadm: looking for devices for /dev/md0
mdadm: cannot open device /dev/md0: Device or resource busy
mdadm: /dev/md0 has wrong uuid.
mdadm: cannot open device /dev/sdc: Device or resource busy
mdadm: /dev/sdc has wrong uuid.
mdadm: no recogniseable superblock on /dev/sdb
mdadm: /dev/sdb has wrong uuid.
mdadm: cannot open device /dev/sda5: Device or resource busy
mdadm: /dev/sda5 has wrong uuid.
mdadm: no recogniseable superblock on /dev/sda3
mdadm: /dev/sda3 has wrong uuid.
mdadm: no recogniseable superblock on /dev/sda2
mdadm: /dev/sda2 has wrong uuid.
mdadm: cannot open device /dev/sda1: Device or resource busy
mdadm: /dev/sda1 has wrong uuid.
mdadm: cannot open device /dev/sda: Device or resource busy
mdadm: /dev/sda has wrong uuid.