btrfs

resize btrfs filesystem

to max:

btrfs filesystem resize max /

by gb:

btrfs filesystem resize +10g /

managing btrfs snapshots

you should use them more often, perhaps in combination with a a backup tool

snapshot utilities

• snapper - automatically create snapshots based on a configuration
• snap-sync - send snapshots to a target destination, another disk locally, ssh etc.

list snapshots

sudo btrfs subvolume list /

create a read only snapshot

sudo btrfs subvolume snapshot / /my_snapshot # root partition
sudo btrfs subvolume snapshot /mnt /mnt/my_snapshot # partition mounted at /mnt

delete btrfs snapshot

sudo btrfs subvolume delete /my_snapshot
sudo btrfs subvolume delete /mnt/my_snapshot

btrfs raid configuration

• btrfs raid calculator

convert raid levels, from raid0 to raid1

btrfs balance start -dconvert=raid1 -mconvert=raid1 /mnt

raid1

with kernel version 5.5+ raid1c3 can be used for the metadata (-m)

mkfs.btrfs -m raid1 -d raid1 /dev/sdb /dev/sdc