当集群出现pg严重分布不均时，ceph内部提供了一个reweight自动调节工具：工具
ceph osd reweight-by-utilization
固然也能够进行手动调整，例如：code
$ ceph osd tree | grep osd.1 1 3 osd.1 up 1 $ ceph osd crush reweight osd.1 3.05 reweighted item id 1 name 'osd.1' to 3.05 in crush map $ ceph osd tree | grep osd.1 1 3.05 osd.1 up 1