BTRFS Notes¶
Arch wiki: https://wiki.archlinux.org/title/btrfs
Btrfs wiki: https://btrfs.wiki.kernel.org/index.php/Main_Page https://btrfs.wiki.kernel.org/index.php/SysadminGuide
Transparent compression https://btrfs.wiki.kernel.org/index.php/Compression
# create btrfs parition
mkfs.btrfs /dev/sda
# mount default subvolume
mount /dev/sda /mnt
# mount subvolume with id 257
mount -o subvolid=257 /dev/sda /mnt
# mount subvolume with path @
mount -o subvol=@ /dev/sda /mnt
# create subvolume at path
btrfs subvolume create path
# list subvolumes recursively in the btrfs of path
btrfs subvolume list -p path
# snapshot
btrfs subvolume snapshot <source> <dest>
Mount use noatime: https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)#NOTES_ON_GENERIC_MOUNT_OPTIONS
Mount option on ssd: -o ssd or -o ssd_spread on less expensive SSD devices: https://btrfs.wiki.kernel.org/index.php/FAQ#What_is_the_difference_between_mount_-o_ssd_and_mount_-o_ssd_spread.3F
Swap file: https://btrfs.wiki.kernel.org/index.php/FAQ#Does_Btrfs_support_swap_files.3F, https://wiki.archlinux.org/title/Btrfs#Swap_file
cp --reflink=auto to use COW copy
Ubuntu style layout: https://help.ubuntu.com/community/btrfs#Ubuntu-specific_subvolume_layout_in_11.04_and_later
Add btrfs snapshots to grub boot menu: https://github.com/Antynea/grub-btrfs
// TODO: free space?
how to fix a broken btrfs system: https://www.youtube.com/watch?v=qHalOdCZO9Q
Created: June 28, 2021