[osd]
	osd journal size = 1000
	filestore attr use omap = true

[mon.a]
	host = Cocke
 	mon addr = 192.168.17.36:6789

[osd.0]
	host = Cocke
	btrfs devs = /dev/sda6

[osd.1]
	host = Wilkinson
	btrfs devs = /dev/sda6

[osd.2]
	host = Knuth
	btrfs devs = /dev/sda6

[mds.a]
	host = Cocke


//---------------------------------------------------
Error and command:

# ceph-osd -i 2 --mkfs --mkkey
2012-12-13 20:18:38.521637 7febe86f8780 must specify '--osd-data=foo' data path
2012-12-13 20:18:38.521732 7febe86f8780 usage: ceph-osd -i osdid [--osd-data=path] [--osd-journal=path] [--mkfs] [--mkjournal] [--convert-filestore]
2012-12-13 20:18:38.521766 7febe86f8780    --debug_osd N   set debug level (e.g. 10)
--conf/-c        Read configuration from the given configuration file
-d               Run in foreground, log to stderr.
-f               Run in foreground, log to usual location.
--id/-i          set ID portion of my name
--name/-n        set name (TYPE.ID)
--version        show version and quit

   --debug_ms N
        set message debug level (e.g. 1)