oninit processes

System: AIX 4.2 ODS : 7.14 UD1 No of CPU : 1 Chunks : all raw devices. Hi, I'm just puzzled by the no of oninit processes when on-line starts up. It seems these oninit processes are related to the NUMAIOVPS onconfig parameter. By default , the NUMAIOVPS is left blank, which according to the Informix guide implies that NUMAIOVPS is 2 for single processor CPU. When left to blank, there are more than 20 oninit processes upon start-up. Using onstat -g iov shows that most of these processes are aio and most of them is not doing any processing. Strangely if I set the NUMAIOVPS to 2, only 7 oninit processes are started up. If I'm using all raw devices for chunks with the exception of a cooked file for the online.log, does these reduced oninit processes have any impact on performance? and why is the blank NUMAIOVPS and a setting of 2 does not produce the no of oninit processes (since default for blank is 2)? Terence Chang