[root@test11 ~]# cat /etc/ceph/crushmap.txt
# begin crush map

# devices
device 0  device0
device 1  device1
device 2  device2
device 3  device3
device 4  device4
device 5  device5
device 6  device6
device 7  device7
device 8  device8
device 9  device9
device 10  device10
device 11  device11

# types
type 0  device
type 1  host
type 2  rack

# buckets
 host  host0 {
	id -1		# do not change unnecessarily
	alg straw
	hash 0	# rjenkins1
	item  device0 weight 1.000
	item  device1 weight 1.000
	item  device2 weight 1.000
	item  device3 weight 1.000
}
 host  host1 {
	id -2		# do not change unnecessarily
	alg straw
	hash 0	# rjenkins1
	item  device4 weight 1.000
	item  device5 weight 1.000
	item  device6 weight 1.000
	item  device7 weight 1.000
}
 host  host2 {
	id -3		# do not change unnecessarily
	alg straw
	hash 0	# rjenkins1
	item  device8 weight 1.000
	item  device9 weight 1.000
	item  device10 weight 1.000
	item  device11 weight 1.000
}
 rack  rack {
	id -4		# do not change unnecessarily
	alg straw
	hash 0	# rjenkins1
	item  host0 weight 4.000
	item  host1 weight 4.000
	item  host2 weight 4.000
}

# rules
rule  data {
	ruleset 0
	type replicated
	min_size 1
	max_size 12
	step take  rack
	step choose firstn 0 type  device
	step emit
}
rule  metadata {
	ruleset 1
	type replicated
	min_size 1
	max_size 12
	step take  rack
	step choose firstn 0 type  device
	step emit
}
rule  casdata {
	ruleset 2
	type replicated
	min_size 1
	max_size 12
	step take  rack
	step choose firstn 0 type  device
	step emit
}
rule  rbd {
	ruleset 3
	type replicated
	min_size 1
	max_size 12
	step take  rack
	step choose firstn 0 type  device
	step emit
}
[root@test11 ~]#