Yes, most of us know we can <ctrl> C it on the way down, but if you are interested in disabling it completely: It is part of System Director which is not implemented much until AIX 7. To disable:
Comment out the following in inittab:
:platform_agent:2:once:/usr/bin/startsrc -s platform_agent >/dev/null 2>&1
:cimservices:2:once:/usr/bin/startsrc -s simsys >/dev/null 2>&1
