检查运行时nearfull和full的阈值：
ceph pg dump | grep full
设置运行时nearfull和full的阈值：
1)、通知pg修改nearfull及full的阈值
ceph pg set_backfillfull_ratio 0.95
ceph pg set_nearfull_ratio 0.95
ceph pg set_full_ratio 0.97
2)、通知mon修改nearfull及full阈值
ceph tell mon.* injectargs "--mon-osd-nearfull-ratio 0.95"
ceph tell mon.* injectargs "--mon-osd-full-ratio 0.97"
ceph tell osd.* injectargs "--mon-osd-nearfull-ratio 0.95"
ceph tell osd.* injectargs "--mon-osd-full-ratio 0.97"
