Q: Which log file contains vSphere HA information?

A: VMware vSphere 5.0 consolidates its status information for vSphere HA's Fault Domain Manager agent into a single log file. This behavior is unlike previous versions where multiple log files were used to store this information. The single log file, found at /var/log/fdm.log, provides information that can assist with issues related to partitioning, isolation, VM protection, agent election, and failover failures.