Question: how to restart qdaemon on aix?
Answer: Determine if the qdaemon has stopped functioning by entering the following ps command: ps -ef | grep qdaemon. ... 
Restart the qdaemon by entering the following startsrc command: startsrc -s qdaemon. ... 
Let the qdaemon print all the jobs in the print queue.
Make sure the lpd daemon is up and running by entering: startsrc -s lpd.