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目的

分析并解决 backfill_toolfull 故障

前提

执行了 ceph 扩容

出现下面故障信息

# ceph -s		cluster xxxxxxxx-8792-4948-b68f-2fcea75f53b9		 health HEALTH_WARN 13 pgs backfill_toofull; 1 pgs degraded; 1 pgs stuck degraded; 13 pgs stuck unclean; 9 requests are blocked > 32 sec; recovery 190/54152986 objects degraded (0.000%); 47030/54152986 objects misplaced (0.087%); 2 near full osd(s); clock skew detected on mon.cephsvr25-128075		 monmap e3: 5 mons at {cephsvr15-128055=xxx.30.128.55:6789/0,cephsvr17-128057=xxx.30.128.57:6789/0,cephsvr24-128074=xxx.30.128.74:6789/0,cephsvr25-128075=xxx.30.128.75:6789/0,cephsvr26-128076=xxx.30.128.76:6789/0}, election epoch 168, quorum 0,1,2,3,4 cephsvr15-128055,cephsvr17-128057,cephsvr24-128074,cephsvr25-128075,cephsvr26-128076		 osdmap e23216: 100 osds: 100 up, 100 in			pgmap v11159189: 20544 pgs, 2 pools, 70024

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