ceph osd tree
# id    weight  type name       up/down reweight
-1      10.47   root default
-2      3.49            host ubuntu41
0       3.49                    osd.0   up      1
-3      3.49            host ubuntu51
1       3.49                    osd.1   up      1
-4      3.49            host ubuntu71
2       3.49                    osd.2   up      1