# mkfs.btrfs -d raid5 -m raid5 -L nwraid /dev/etherd/e1.1 /dev/etherd/e2.1 /dev/etherd/e3.1

 WARNING! - Btrfs v0.20-rc1 IS EXPERIMENTAL
 WARNING! - see http://btrfs.wiki.kernel.org before using

 adding device /dev/etherd/e2.1 id 2
 adding device /dev/etherd/e3.1 id 3
 Setting RAID5/6 feature flag
 fs created label nwraid on /dev/etherd/e1.1
         nodesize 4096 leafsize 4096 sectorsize 4096 size 29.30GB
 Btrfs v0.20-rc1