3-disk RAID10

gistfile1.txt

root@ubuntu-xenial:~# fallocate -l 1G disk1
root@ubuntu-xenial:~# fallocate -l 1G disk2
root@ubuntu-xenial:~# fallocate -l 1G disk3
root@ubuntu-xenial:~# losetup /dev/loop0 ./disk1
root@ubuntu-xenial:~# losetup /dev/loop1 ./disk2
root@ubuntu-xenial:~# losetup /dev/loop2 ./disk3
root@ubuntu-xenial:~# mdadm -C /dev/md0 -l 10 -n 3 --layout f2 /dev/loop[012]
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
root@ubuntu-xenial:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid10 loop2[2] loop1[1] loop0[0]
      1571328 blocks super 1.2 512K chunks 2 far-copies [3/3] [UUU]
      [========>............]  resync = 42.0% (661504/1571328) finish=0.0min speed=220501K/sec
root@ubuntu-xenial:~# lsblk /dev/md0
NAME MAJ:MIN RM  SIZE RO TYPE   MOUNTPOINT
md0    9:0    0  1.5G  0 raid10