Re: kaio question

> 1. how do I know informix is using kaio instead of aiovp? When you bring the engine up, there's usually an entry in the message log indicating that KAIO is in use. You can also do an onstat command and see if there are any kaio threads in use. onstat -u or onstat -g ath should do it, I think. > 2. how do I turn kaio on if it is not on? Check your release notes. You generally have to enable it on the system first by creating a /dev/async, or something similar. Then set KAIOON=1. Again, check your release notes, cuz that's off the top of my head. Finally, make sure you're using devices that support asynchronous I/O--cooked files, for example, won't use it. For raw devices, you want character-special, not block-special. > 3. generally how much a performance boost do I get with kaio instead > of aiovp? YMMV. My personal experience is about a 15% gain on HP-UX systems. Others have run into bugs or complications where performance has actually gone down. It's very easy to try it both ways.