Problem(Abstract)
KAIO is not enabled when chunks are created on raw devices. OS and related environment are no problems.
Cause
ls -l shows that the chunks are in the raw devices which are created as block devices by mistake.
ls -l
brw-rw---- 1 root system 22, 1 Aug 4 2012 rootchk
brw-rw---- 1 root system 22, 1 Aug 4 2012 llogchk
brw-rw---- 1 root system 22, 1 Aug 4 2012 plogchk
brw-rw---- 1 root system 22, 1 Aug 4 2012 datachk
The raw devices should be character devices.
crw-rw---- 1 root system 22, 1 Aug 4 2012 rootchk
crw-rw---- 1 root system 22, 1 Aug 4 2012 llogchk
crw-rw---- 1 root system 22, 1 Aug 4 2012 plogchk
crw-rw---- 1 root system 22, 1 Aug 4 2012 datachk
Resolving the problem
Change the devices to character devices with relative OS commands and restart Informix Server. Then KAIO will be enabled correctly.
http://www-01.ibm.com/support/docview.wss?uid=swg21646086&myns=swgimgmt&mynp=OCSSGU8G&mync=E
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