Faults Location
Check carefully to see where the fault really is. Check the information provided by the MX-ONE Service Node to get information about the fault. Mostly, the fault will not be related to the database.
Log Files
Like all LINUX-based systems, the MX-ONE Service Node uses syslog (the system logging daemon) for logging of diagnostic messages. There is a configuration of syslog where to store or forward the messages, but normally the relevant messages will be found in the file /var/log/messages.
For the Cassandra database look in the /var/log/cassandra/ folder for the files "debug.log" and "system.log".
Alarms
Check with the command alarm to print (list) alarms in the alarm log. Use alarm -p --format detail to see the detailed information. The detailed alarm information points at the exact fault.
Fault Messages
Use the command trace -print 0 to print the fault messages in the system. The fault messages can be very useful when trying to understand a fault. But often an experienced service technician is needed to understand the information in the fault messages.