Create RAID config file

A RAID1 mirrored array on /dev/sda1 and /dev/sdb1

mdadm --detail --scan > /etc/mdadm.conf
mdadm --detail --scan > /etc/mdadm/mdadm.conf

ARRAY /dev/md0 metadata=1.2 name=lpic.umoswg.net:0 UUID=random_string

Create RAID config file

mdadm --examine --scan > /etc/mdadm.conf

cat /etc/mdadm.conf
 
 ARRAY /dev/md/0 metadata=1.2 UUID=6a803a1b:886e08d5:55aca46e:6548ec4f name=raid-lvm-test:0
 ARRAY /dev/md/1 metadata=1.2 UUID=79208157:72d2d9cd:5b1110e8:f5783ebf name=raid-lvm-test:1