Pgs distribution evenly across osds

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Hi Sage,
  We are trying to distribute pgs evenly across osds. However, after certain tunes, we still got 30% difference among max pgs  and min pg  of OSDs (OSD 9 has 13.8% more pgs than average and OSD 86 has 15.2% less pgs than average).  Any good suggestions to make PGs distributed evenly across OSDs?
  
  Thanks,
  James
    

SUM :   49152   |
Osd :   168     |
AVE :   292.57  |
Max :   333     |
Osdid : osd.9   |
per:    13.8%   |
------------------------
min :   248     |
osdid : osd.86  |
per:    -15.2%  |

[james.liu@a18d13422.eu13 /home/james.liu]
$


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