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 + stripe data)

mkfs.btrfs /dev/sda /dev/sdb /dev/sdc

• create subvolume

btrfs subvolume create /mnt/nonsense

where /mnt is the mountpoint of the btrfs volume

• create snapshot

mkdir /mnt/snapshots
btrfs subvolume snapshot /mnt/nonsense /mnt/snapshots/vrijdag

• add a new device

btrfs device add /dev/sda8 /mnt

• balance the data

btrfs device balance /mnt