RAID1 disk setup

LUKS + ext4 on one disk

Let /dev/sdb be the disk.

# Create partition
  sudo cfdisk /dev/sdb -> cerate partition /dev/sdb1
# Initialize disk data with random bits
  sudo shred --verbose --random-source=/dev/urandom --iterations=3 /dev/sdb1
# Create the cryptographic device (leave hash and iter-time to default values if the drive will be mounted on a slow device)
  sudo cryptsetup --verbose --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 luksFormat /dev/sdb1
# Open device
  sudo cryptsetup open --type luks /dev/sdb1 DEVSDB1
# Format partition
  sudo mkfs.ext4 -L PARTITIONLABEL /dev/mapper/DEVSDB1
# Close device
  sudo cryptsetup luksClose DEVSDB1

RAID1(Btrfs) LUKS-encrypted on two disks

let sdb and sdc be these two disks

#  encrypt the disks with luks (leave hash and iter-time to default values if the drive will be mounted on a slow device)
sudo cryptsetup --verbose --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 luksFormat /dev/sdb
sudo cryptsetup --verbose --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 luksFormat /dev/sdc
# Unlock these two disks
sudo cryptsetup luksOpen /dev/sdb sdbmapper
sudo cryptsetup luksOpen /dev/sdc sdcmapper
# Create the Btrfs RAID1
sudo mkfs.btrfs -L VOLUME_NAME -m raid1 -d raid1 /dev/mapper/sdbmapper /dev/mapper/sdcmapper
# Mount one of the drives of the RAID1
sudo mount /dev/mapper/sdbmapper /mnt

RAID1(mdadm) LUKS + ext4 on two disks

let sdb and sdc be these two disks

# Create the mdadm RAID1
    sudo mdadm --create /dev/md0 --chunk=4 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
# OR assemble an existing array
    sudo mdadm --assemble --scan --verbose /dev/md0 /dev/sdb /dev/sdc                            
    
# Encrypt the RAID array with luks (leave hash and iter-time to default values if the drive will be mounted on a weak cpu device)
    sudo cryptsetup --verbose --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 luksFormat /dev/md0
# Unlock the encrypted array
    sudo cryptsetup luksOpen /dev/md0 md0mapper
# Format partition
    sudo mkfs.ext4 -L PARTITIONLABEL -b 4096 -E stride=8 /dev/mapper/md0mapper
# Close device
  sudo cryptsetup luksClose md0mapper
  
# DeOpen+mount partition
    sudo cryptsetup luksOpen /dev/md0 md0mapper
    sudo mount /dev/mapper/md0mapper /mnt
# Umount+close partition
    sudo umount /mnt
    sudo cryptsetup luksClose md0mapper