I decided to "fence_node -vv node2" and node3.
After boot, the two faulty nodes are again in cluster.
"fence_tool ls"
node2,node3 think fence master is node4
node4,node8,node11 think fence master is node2
also victims vary
root@node2:~# for i in 2 3 4 8 11; do ssh node$i fence_tool ls; done...