Centos 6.4Ceph Cuttlefish 0.61.7, or 0.61.8.
I changed the MTU to 9216(or 9000), then restarted all the cluster nodes. The
whole cluster hung, with messages in the mon log as below:4048 2013-08-26
15:52:43.028554 7fd83f131700 1 mon.ceph0@0(electing).elector(15) init, last
seen epoch 154049 2013-08-26 15:52:46.431842 7fd83f131700 1
mon.ceph0@0(electing) e1 discarding message auth(proto 0 30 bytes epoch 1) v1
and sending client elsewhere4050 2013-08-26 15:52:46.431886 7fd83f131700 1
mon.ceph0@0(electing) e1 discarding message auth(proto 0 30 bytes epoch 1) v1
and sending client elsewhere4051 2013-08-26 15:52:46.431899 7fd83f131700 1
mon.ceph0@0(electing) e1 discarding message auth(proto 0 26 bytes epoch 1) v1
and sending client elsewhere4052 2013-08-26 15:52:46.431911 7fd83f131700 1
mon.ceph0@0(electing) e1 discarding message auth(proto 0 27 bytes epoch 1) v1
and sending client elsewhere4053 2013-08-26 15:52:46.431923 7fd83f131700 1
mon.ceph0@0(electing) e1 discarding message auth(proto 0 30 bytes epoch 1) v1
and sending client elsewhere4054 2013-08-26 15:52:46.431937 7fd83f131700 1
mon.ceph0@0(electing) e1 discarding message auth(proto 0 26 bytes epoch 0) v1
and sending client elsewhere4055 2013-08-26 15:52:46.431948 7fd83f131700 1
mon.ceph0@0(electing) e1 discarding message auth(proto 0 26 bytes epoch 1) v1
and sending client elsewhere4056 2013-08-26 15:52:48.028808 7fd83f131700 1
mon.ceph0@0(electing).elector(15) init, last seen epoch 154057 2013-08-26
15:52:51.432073 7fd83f131700 1 mon.ceph0@0(electing) e1 discarding message
auth(proto 0 26 bytes epoch 0) v1 and sending client elsewhere4058 2013-08-26
15:52:51.432116 7fd83f131700 1 mon.ceph0@0(electing) e1 discarding message
auth(proto 0 27 bytes epoch 1) v1 and sending client elsewhere4059 2013-08-26
15:52:51.432129 7fd83f131700 1 mon.ceph0@0(electing) e1 discarding message
auth(proto 0 26 bytes epoch 1) v1 and sending client elsewhere4060 2013-08-26
15:52:51.432147 7fd83f131700 1 mon.ceph0@0(electing) e1 discarding message
auth(proto 0 27 bytes epoch 1) v1 and sending client elsewhere4061 2013-08-26
15:52:53.029037 7fd83f131700 1 mon.ceph0@0(electing).elector(15) init, last
seen epoch 15
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