Someone

sinope:/etc/mdadm# mdadm -A /dev/md1 /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sdf
mdadm: /dev/md1 assembled from 1 drive - not enough to start the array.
sinope:/etc/mdadm# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md1 : inactive sdf[6](S) sdc[2](S) sdb[1](S) sda[0](S) sdd[4](S)
      1562855680 blocks super 1.0

md0 : active raid0 sdh1[0] sdg1[1]
      488391808 blocks 64k chunks

unused devices: <none>

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sinope:/etc/mdadm# mdadm -D /dev/md1
mdadm: md device /dev/md1 does not appear to be active.