The Oracle VM Agent log files are stored in the /var/log/ovs-agent directory on each Oracle VM Server:
ovs_autorun.log Logs the automatic startup of the Agent whenever the VM Server boots. This is where you will find the OCFS startup information as well as the Agent startup information.
ovs_guard.log Logs cluster information used in an Oracle VM High Availability (HA) environment.
ovs_operation.log Logs Oracle VM Agent operations. ...