Re: NUMAIOVPS setting for KAIO

Chao Y. Din (cdin@csc.com) wrote: : Fred Krefting wrote: : > : > David Samuels wrote: : > > : > > ==========Lin-Chuan Lee, 7/29/96========== : > > What is recommended setting in general ( assume on platform : > > with no KAIO) ?? A Performnace tuning guide I got in class : > > states 1x number of disks but I also remeber the instructor : > > saying that sometimes it's better to go with 2x. > : > : > I just returned from a performance tuning class, 7.x, and my instructor : > said 1 per physical disk with raw chunks and 2 per disk with cooked : > chunks. But in reality you can probably get by with less. Check the : > onstat -g ioq or glo to see how busy the aio v-cpu's are. : What if KAIO is available? Should NUMAIOVPS be 1 if KAIO is available : regardless the number of disks? : Chao My understanding is if KAIO is available, set NUMAIOVPS to 2. These AIOVPs will be used to write to control files, ie. the message log. -- +----------------------------+------------------------------------------+ | Barry Lemrow | Disclaimer: | | Technical Consultant | "Opinions expressed are mine and not | | SAP National Practice | necessarily those of my employer, | | Hewlett-Packard | family, or friends!" | | blemrow@a3166tpa.ssr.hp.com| | +----------------------------+------------------------------------------+ | You can't have something for nothing. You can't get freedom for free.| | You won't get wise with the sleep still in your eyes, no matter what | | your dream might be! -- N. Peart, "Something for Nothing" | +----------------------------+------------------------------------------+