Raid 1 with MDADM

create RAID1 with 2 phys disks

mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc

save to config file

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

start/stop/restart an array

mdadm --stop /dev/md0 

mdadm --remove /dev/md0

mdadm --assemble /dev/md0

check state of array

mdadm --detail /dev/md0

Create filestystem

mkfs.ext4 /dev/md0

mkdir /data01

mount /dev/md0 /data01