KAIO clarification.

Hello folks, I could use a little clarification about using KAIO under SOlaris. We are running On-line 7.11 under Solaris 2.4. An informix engineer told us that we should set NUMAIOVPS to use more than one AIOVP and this would have a major impact on performance. However: - Everything I have read in the manuals and in Suto's book indicates that we should not set NUMAIOVPS if we are using KAIO (Kernel Asynchronous IO). - Everything I have read indicates that KAIO will automatically be used if our kernel supports it and we are using raw devices (which we are). - The Informix release notes for Solaris say that "Kernel AIO is a standard feature of Solaris 2.4 and is supported" - Suto's book says that onstat -g ioq will show a "kio queue" if and only if we're using KAIO. Well, I did onstat -g ioq and didn't see a kio queue, but onstat -g ath does show a number of aio vps. Can somebody clarify this for me? --- how do I know wether we are actually using KAIO, and if we're not, what do I have to do start using KAIO? Thanks in advance, -Bruce Cota P.S. If it matters, the raw devices are on a Sparc storage array that we manage with a Veritas volumen manager.