Specifies the number of archives of the old message log maintained by the server.
-iqmsgnum num
Allowed values are integers 0 – 64 (inclusive). Default value is 0, which means that messages are wrapped in the main message log file. Takes effect only if -iqmsgsz or the IQMsgMaxSize server property is a value other than zero. The IQMsgNumFiles server property corresponds to -iqmsgnum and takes precedence over the value of -iqmsgnum.
start_iq -n iqdemo iqdemo.db ... <other options> ... -iqmsgsz 100 -iqmsgnum 3