[root@plateau ~]# mdadm --assemble --scan -v -f
mdadm: looking for devices for /dev/md0
mdadm: cannot open device /dev/dm-0: Device or resource busy
mdadm: /dev/dm-0 has wrong uuid.
mdadm: cannot open device /dev/sdd1: Device or resource busy
mdadm: /dev/sdd1 has wrong uuid.
mdadm: cannot open device /dev/sdd: Device or resource busy
mdadm: /dev/sdd has wrong uuid.
mdadm: cannot open device /dev/sdc1: Device or resource busy
mdadm: /dev/sdc1 has wrong uuid.
mdadm: cannot open device /dev/sdc: Device or resource busy
mdadm: /dev/sdc has wrong uuid.
mdadm: cannot open device /dev/sdb2: Device or resource busy
mdadm: /dev/sdb2 has wrong uuid.
mdadm: no RAID superblock on /dev/sdb1
mdadm: /dev/sdb1 has wrong uuid.
mdadm: cannot open device /dev/sdb: Device or resource busy
mdadm: /dev/sdb has wrong uuid.
mdadm: no RAID superblock on /dev/sda6
mdadm: /dev/sda6 has wrong uuid.
mdadm: cannot open device /dev/sda5: Device or resource busy
mdadm: /dev/sda5 has wrong uuid.
mdadm: no RAID superblock on /dev/sda4
mdadm: /dev/sda4 has wrong uuid.
mdadm: cannot open device /dev/sda3: Device or resource busy
mdadm: /dev/sda3 has wrong uuid.
mdadm: cannot open device /dev/sda2: Device or resource busy
mdadm: /dev/sda2 has wrong uuid.
mdadm: no RAID superblock on /dev/sda1
mdadm: /dev/sda1 has wrong uuid.
mdadm: cannot open device /dev/sda: Device or resource busy
mdadm: /dev/sda has wrong uuid.
mdadm: /dev/sdh is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdg is identified as a member of /dev/md0, slot 1.
mdadm: /dev/sdf is identified as a member of /dev/md0, slot 0.
mdadm: /dev/sde is identified as a member of /dev/md0, slot 4.
mdadm: forcing event count in /dev/sdh(2) from 3189208 upto 3189214
mdadm: clearing FAULTY flag for device 0 in /dev/md0 for /dev/sdh
mdadm: added /dev/sdg to /dev/md0 as 1
mdadm: added /dev/sdh to /dev/md0 as 2
mdadm: no uptodate device for slot 3 of /dev/md0
mdadm: added /dev/sde to /dev/md0 as 4
mdadm: added /dev/sdf to /dev/md0 as 0
mdadm: /dev/md0 has been started with 3 drives (out of 4) and 1 spare.