处理ceph时钟偏移问题

1、时钟偏移问题

[root@node5 ~]# ceph -w

    cluster b516386f-cb9d-49d5-bf48-07f0dac29e97

     health HEALTH_WARN 192 pgs degraded; 192 pgs stuck unclean

     monmap e1: 3 mons at {node1=10.240.217.101:6789/0,node4=10.240.217.104:6789/0,node5=10.240.217.105:6789/0}, election epoch 18, quorum 0,1,2 node1,node4,node5

     osdmap e63: 3 osds: 2 up, 2 in

      pgmap v249: 192 pgs, 3 pools, 0 bytes data, 0 objects

            10314 MB used, 2063 GB / 2073 GB avail

                 192 active+degraded

2014-06-19 10:46:24.736860 mon.0 [WRN] mon.1 10.240.217.104:6789/0 clock skew 0.060021s > max 0.05s

解决上面问题的方法：

ceph默认的时钟偏移的时间是0.05s，因为这个时间过小，致使集群间的时间偏移值都大于0.05s,解决这个问题

须要到各个monitor节点修改ceph.conf的配置，在配置文件中加入下面的配置

[root@node1 ~]# vi /etc/ceph/ceph.conf 

[mon]

mon clock drift allowed = .50

修改后重启ceph进程

[root@node1 ~]# service ceph restart

=== mon.node1 === 

=== mon.node1 === 

Stopping Ceph mon.node1 on node1...kill 4723...done

=== mon.node1 === 

Starting Ceph mon.node1 on node1...

Starting ceph-create-keys on node1...

更详细的处理方法能够看官方文档

http://ceph.com/docs/master/rados/configuration/mon-config-ref/#monitor-store-synchronization