Btrfs
- list available devices
btrfs device scan
- list available filesystems
btrfs filesystem show
- create volume
mkfs.btrfs /dev/sdX
- stripe across devices (mirror metadata + stripe data)
mkfs.btrfs /dev/sda /dev/sdb /dev/sdc
- stripe across devices (stripe metadata + stripe data)
mkfs.btrfs -m raid0 /dev/sda /dev/sdb /dev/sdc
- mirror across devices (mirror metadata + mirror data)
mkfs.btrfs -m raid10 -d raid10 /dev/sda /dev/sdb /dev/sdc
- create subvolume
btrfs subvolume create /mnt/nonsense
where /mnt is the mountpoint of the btrfs volume
- list subvolumes
btrfs subvolume list /mnt
- create snapshot
mkdir /mnt/snapshots btrfs subvolume snapshot /mnt/nonsense /mnt/snapshots/vrijdag
- add a new device
btrfs device add /dev/sda8 /mnt
- remove a device
btrfs delete /dev/sdb /mnt
- balance the data (takes some time)
btrfs device balance /mnt
- free space:
btrfs fi df /
- show snapshots
snapper list
- delete all snapshots
for i in {1..20000}; do snapper delete $i; done