Ceph

The osd on the node181 weight has been reduced when use "ceph osd reweight-by-utilization 101"

[root@node173 ceph-0.94.5]# ceph osd tree
ID WEIGHT  TYPE NAME        UP/DOWN REWEIGHT PRIMARY-AFFINITY 
-4       0 root a                                             
-1 1.45995 root default                                       
-2 1.15997     host node181                                   
 0 0.07999         osd.0         up  0.75380          1.00000 
 2 0.07999         osd.2         up  0.75380          1.00000 
 1 1.00000         osd.1         up  0.37688          1.00000 
-3 0.29997     host node173                                   
 3 0.09999         osd.3         up  1.00000          1.00000 
 4 0.09999         osd.4         up  1.00000          1.00000 
 5 0.09999         osd.5         up  1.00000          1.00000 
[root@node173 ceph-0.94.5]# ceph osd reweight-by-utilization 101
SUCCESSFUL reweight-by-utilization: average 0.729164, overload 0.736456. reweighted: osd.0 [0.753799 -> 0.711777], osd.1 [0.376877 -> 0.355865], osd.2 [0.753799 -> 0.711777], 
[root@node173 ceph-0.94.5]# ceph osd reweight-by-utilization 101
SUCCESSFUL reweight-by-utilization: average 0.729446, overload 0.736740. reweighted: osd.0 [0.672302 -> 0.635010], osd.1 [0.336136 -> 0.317505], osd.2 [0.672302 -> 0.635010], 

I want to increase the osd node181 weight, use the command "ceph osd reweight-by-utilization 110"
but only hint: "no change: average 0.730862, overload 0.803948. reweighted: (none)"
I tried the number between 110 ~ 200, is the tip

[root@node173 ceph-0.94.5]# ceph osd reweight-by-utilization 101
SUCCESSFUL reweight-by-utilization: average 0.730363, overload 0.737667. reweighted: osd.0 [0.565125 -> 0.532349], osd.1 [0.282547 -> 0.266159], osd.2 [0.565125 -> 0.532349], 
[root@node173 ceph-0.94.5]# ceph osd reweight-by-utilization 110
no change: average 0.730862, overload 0.803948. reweighted: (none)