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root@debian:~# mdadm -S /dev/md126
mdadm: stopped /dev/md126

root@debian:~# mdadm -S /dev/md127
mdadm: stopped /dev/md127

root@debian:~# cat /proc/mdstat 
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10] 
unused devices: none

root@debian:~# mdadm -Asv
mdadm: looking for devices for further assembly
mdadm: no RAID superblock on /dev/sda1
mdadm: no DDF anchor found on /dev/sda
mdadm: no RAID superblock on /dev/sda
mdadm: no RAID superblock on /dev/sdb1
mdadm: no DDF anchor found on /dev/sdb
mdadm: no RAID superblock on /dev/sdb
mdadm: Cannot read anchor block on /dev/sr0: Invalid argument
mdadm: no RAID superblock on /dev/sr0
mdadm: /dev/sdc is identified as a member of /dev/md/ddf0, slot 0.
mdadm: /dev/sdf is identified as a member of /dev/md/ddf0, slot 3.
mdadm: /dev/sde is identified as a member of /dev/md/ddf0, slot 2.
mdadm: /dev/sdd is identified as a member of /dev/md/ddf0, slot 1.
mdadm: added /dev/sdd to /dev/md/ddf0 as 1
mdadm: added /dev/sde to /dev/md/ddf0 as 2
mdadm: added /dev/sdf to /dev/md/ddf0 as 3
mdadm: added /dev/sdc to /dev/md/ddf0 as 0
mdadm: Container /dev/md/ddf0 has been assembled with 4 drives
mdadm: looking for devices for further assembly
mdadm: looking for devices for further assembly
mdadm: /dev/sdc is busy - skipping
mdadm: /dev/sdf is busy - skipping
mdadm: /dev/sde is busy - skipping
mdadm: no recogniseable superblock on /dev/sda1
mdadm: Cannot assemble mbr metadata on /dev/sda
mdadm: /dev/sdd is busy - skipping
mdadm: no recogniseable superblock on /dev/sdb1
mdadm: Cannot assemble mbr metadata on /dev/sdb
mdadm: no recogniseable superblock on /dev/sr0
mdadm: looking in container /dev/md/ddf0
mdadm: found match on member /md127/0 in /dev/md/ddf0
mdadm: Started /dev/md/pokus with 4 devices
mdadm: looking for devices for further assembly
mdadm: /dev/sdc is busy - skipping
mdadm: /dev/sdf is busy - skipping
mdadm: /dev/sde is busy - skipping
mdadm: /dev/sdd is busy - skipping
mdadm: looking in container /dev/md/ddf0
mdadm: member /md127/0 in /dev/md/ddf0 is already assembled
mdadm: looking for devices for further assembly
mdadm: no recogniseable superblock on /dev/md/pokus
mdadm: /dev/sdc is busy - skipping
mdadm: /dev/sdf is busy - skipping
mdadm: /dev/sde is busy - skipping
mdadm: no recogniseable superblock on /dev/sda1
mdadm: Cannot assemble mbr metadata on /dev/sda
mdadm: /dev/sdd is busy - skipping
mdadm: no recogniseable superblock on /dev/sdb1
mdadm: Cannot assemble mbr metadata on /dev/sdb
mdadm: no recogniseable superblock on /dev/sr0
mdadm: looking in container /dev/md/ddf0
mdadm: member /md127/0 in /dev/md/ddf0 is already assembled

root@debian:~# cat /proc/mdstat 
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10] 
md126 : active (auto-read-only) raid5 sdc[3] sdd[2] sde[1] sdf[0]
      62816256 blocks super external:/md127/0 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]

md127 : inactive sdc[3](S) sdf[2](S) sde[1](S) sdd[0](S)
      131072 blocks super external:ddf

unused devices: none

mdadm --create /dev/md/pokus -n4 -l5 /dev/md/ddf
mdadm --create /dev/md/ddf --metadata=ddf --raid-disks 4 /dev/sd[c-f]