Daviteusz/RaspiOS_BTRFS.md

## RaspiOS_BTRFS.md

      
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              RaspiOS_BTRFS.md
            
          
    BTRFS on RaspberryPi OS 12 (bookworm)


It is best to follow these steps on a PC.
If you fresh install your RaspiOS, then boot RPI once to complete OS configuration.

Convert MBR to GPT (optional)


mbr2gpt can be found here.

# ./mbr2gpt /dev/sdX

Convert EXT4 to BTRFS

# btrfs-convert /dev/sdX2

Create subvolumes

# mount /dev/sdX1 /mnt/bootfs
# mount /dev/sdX2 /mnt/rootfs

# cd /mnt/rootfs
# btrfs subvolume create @
# btrfs subvolume create @home
# btrfs subvolume create @log
# btrfs subvolume create @archives
# btrfs subvolume create @.snapshots

Remove old ext4 subvolume

# btrfs subvolume delete ext2_saved

Move everything to subvolumes

# cp -P lib @/lib
# cp -P sbin @/sbin
# rm -r lib/ sbin/
# mv home/* @home/
# rm -r home/
# for i in var boot etc opt media mnt srv tmp usr root bin dev proc run sys initrd.img vmlinuz; do mv $i @/$i; done

Update bootfs/cmdline.txt


How to get PARTUUID?

# blkid /dev/sdX2

... root=PARTUUID=S0me-P4RTUU1D rootfstype=btrfs rootflags=subvol=@ fsck.repair=no ...

Update rootfs/@/etc/fstab

# rootfs
PARTUUID=S0me-P4RTUU1D   /                       btrfs   noatime,nodiratime,rw,relatime,ssd,discard=async,space_cache=v2,subvolid=257,subvol=/@  0 0
PARTUUID=S0me-P4RTUU1D   /home                   btrfs   rw,relatime,ssd,discard=async,space_cache=v2,subvolid=258,subvol=/@home                 0 0
PARTUUID=S0me-P4RTUU1D   /var/log                btrfs   rw,relatime,ssd,discard=async,space_cache=v2,subvolid=259,subvol=/@log                  0 0
PARTUUID=S0me-P4RTUU1D   /var/cache/apt/archives btrfs   rw,relatime,ssd,discard=async,space_cache=v2,subvolid=260,subvol=/@archives             0 0
PARTUUID=S0me-P4RTUU1D   /.snapshots             btrfs   rw,relatime,ssd,discard=async,space_cache=v2,subvolid=261,subvol=/@.snapshots           0 0