没啥好说的，就是修改Ceph集群里存储池pool的CrushRule规则、备份数size和最小备份数min_size
修改CrushRule：ceph osd pool set [存储池名] crush_rule [CrushRule规则名]
修改默认备份数：ceph osd pool set [存储池名] size [份数]
修改最小备份数（低于这个就停止写入）：ceph osd pool set [存储池名] min_size [份数]
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