mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda1 dev/sdb1 cat /proc/mdstat mkfs.ext4 /dev/md0 blkid mdadm --detail --scan >> /mnt/etc/mdadm.conf # edit /etc/mdadm.conf ARRAY /dev/md0 UUID=xxxxxxxx:xxxxxxxx:xxxxxxxx:xxxxxxxx # edit /etc/fstab UUID=xxxxxxxx:xxxxxxxx:xxxxxxxx:xxxxxxxx /mnt/raid1 ext4 errors=continue 0 2 # Add mdadm hook to mkinitcpio.conf if as a boot drive # edit mkinitcpio.conf HOOKS="base udev autodetect block mdadm_udev filesystems usbinput fsck" mkinitcpio # reboot mdadm --detail /dev/md0