Trace file's rotation and system restart

You have lost the trace file to perform an anlysis on the system behavior after an error/crash/hung situation.

Every system restart, the trace files are overwritten.
When you start the instance, all files from the services (message
server, dispatcher, work process, ICM and others) are truncated and only
the actual log status information are writen.

But, before truncate the actual trace files, the system create a backup
of this trace file with the .old extension.

Although exist the mechanism to create a backup of the trace file, if
you restart the system more than one time, the .old trace file will be
overwritten too.

A good pratice is make a copy of the work directory before the start up.