The directory /var/cluster/ucmm contains the following sources of diagnostic information:
Core files
Log files that provide the following information:
Details of userland cluster membership monitor (UCMM) reconfigurations
Time-out settings
Events that are logged by the UNIX Distributed Lock Manager (Oracle UDLM)
The system messages file also contains diagnostic information.
If a problem occurs with Sun Cluster Support for Oracle Parallel Server/Real Application Clusters, consult these files to obtain information about the cause of the problem.