lollipopcloud/advanced/raspberrry_pi_usb_btrfs_root.md

Running a Raspberry Pi with USB based btrfs root filesystem

This is a very advanced configuration and here as a set of notes for the more daring users building remixes.

Please note: you will need to change /dev/sda and /dev/sdb as well as any sizes and offsets to match your needs and approach.

dd if=/dev/sda of=/dev/sdb bs=1M
parted /dev/sdb
    mkpart
    33G
    -1
    q
mkfs.btrfs \
    -L writable \
    /dev/sdb3
mkdir /mnt/new
mkdir /mnt/orig
mount /dev/sdb2 /mnt/orig
mount -o autodefrag,compress,ssd,ssd_spread /dev/sdb3 /mnt/new
rsync -aPr --delete-after /mnt/orig/ /mnt/new/
nano -w /mnt/new/etc/fstab
    btrfs filesystem type && mount options
mount /dev/sdb1 /mnt/new/boot/firmware
nano -w /mnt/new/boot/firmware/config.txt /mnt/new/boot/firmware/cmdline.txt
umount /mnt/orig
pvcreate /dev/sdb2
vgcreate misc /dev/sdb2
lvcreate -C y -n swap.1 -L 1G misc
lvcreate -n scratch -L 6G misc
mkswap /dev/mapper/misc-swap.1
mkfs.btrfs -L scratch /dev/mapper/misc-scratch
mkdir /scratch
nano -w /mnt/new/etc/fstab
    add lvm swap
    add lvm scratch