Btrfs

Warning Warning: Btrfs is still a new filesystem. While many (including myself) find it stable enough for everyday use, don't use it for critical services and be prepared to use you backups.
See status page on Btrfs wiki for up-to-date info.

Install

To create and manipulate Btrfs volumes, you will need to install

$ sudo apt install btrfs-progs

Create a filesystem

mkfs

Single Disk

$ sudo mkfs.btrfs /dev/sdb

Raid 1

$ sudo mkfs.btrfs -mraid1 -draid1 /dev/sdb /dev/sdc

Raid 0

$ sudo mkfs.btrfs -mraid1 -draid0 /dev/sdb /dev/sdc

Mount

$ sudo mount /dev/sdb /mnt

When mounting raid disks, only one of the disks need to be specified in the command. Btrfs will find the other one automatically.

Subvolumes

To create a subvolume just use the command

$ sudo btrfs subvolume create /<path>

To create a snapshot use

$ sudo btrfs subvolume snapshot /<source-path> /<destination-path>