sudo mdadm --detail /dev/md127
/dev/md127:
        Version : imsm
     Raid Level : container
  Total Devices : 2

Working Devices : 2


           UUID : 4b914255:153bbe5c:ba75320a:feb67d6b
  Member Arrays : /dev/md126

    Number   Major   Minor   RaidDevice

       0       8        0        -        /dev/sda
       1       8       16        -        /dev/sdb
kubuntu@kubuntu:~$ mdadm --assemble --force /dev/md127
mdadm: must be super-user to perform this action
kubuntu@kubuntu:~$ sudo mdadm --assemble --force /dev/md127
mdadm: /dev/md127 not identified in config file.