Figure: Example scenario I scenario could cause similar symptoms on a two-node cluster with one node shut down for maintenance. During the outage, the private interconnect cables are disconnected.
Node 0 has keys registered on the coordinator disks. When Node 1 boots up, it sees the Node 0 keys, but cannot see Node 0 in the current GAB membership. It senses a potential preexisting split brain and causes the vxfen module to print an error message to the console. The vxfen module prevents fencing from starting, which, in turn, prevents VCS from coming online.