Verify from the vxfenadm output that the fencing mode reflects the configuration in the /etc/vxfenmode file.
To verify I/O fencing configuration
# vxfenadm -d
Output similar to the following appears if the fencing mode is majority:
I/O Fencing Cluster Information: ================================ Fencing Protocol Version: 201 Fencing Mode: MAJORITY Cluster Members: * 0 (sys1) 1 (sys2) RFSM State Information: node 0 in state 8 (running) node 1 in state 8 (running)