|     0     |     1          |     2                 |     3
---+-----------+----------------+-----------------------+-------------
  5|sdn        |sdo             |sdp                    |sdu
   |md100(sdn1)|/mnt/media(sdo1)|/mnt/media-backup(sdp1)|
---+-----------+----------------+-----------------------+-------------
  4|sdq        |sdr             |sds                    |sdt
   |md40(sdq1) |md40(sdr1)      |md40(sds1)             |md20[S](sdt)
---+-----------+----------------+-----------------------+-------------
  3|sdf        |sdg             |sdh                    |sdi
   |md20(sdf6) |md20(sdg6)      |md20(sdh6)             |md20[S](sdi6)
---+-----------+----------------+-----------------------+-------------
  2|sdj        |sdk             |sdl                    |sdm
   |md10(sdj1) |md10(sdk1)      |md10(sdl1)             |md10(sdm1)
---+-----------+----------------+-----------------------+-------------
  1|           |sdd             |                       |sde
   |           |                |                       |md0(sde1)
   |           |                |                       |md1(sde2)
---+-----------+----------------+-----------------------+-------------
  0|sda        |                |sdb                    |sdc
   |md0(sda1)  |                |md20[S](sdb1)          |md100(sdc1)
   |md1(sda2)  |                |                       |

md20 status: checking 88.8% completed (69.7 Mi/s), ETA 2015-05-17 19:40:00