I have been able to drive VM systems at 100% CPUbusy for months at a time . The problems that came up were when you had a small number of very large guests that all wanted everything all at the same time. The smaller the guests, the more guests you have, the shorter they need the CPU in any on e shot, the better response you will have at 100% CPUbusy. If you have one Websphere guest and one DB2 guest and they both want 100+% of the box NOW , you will get poor performance.
/Tom Kern On Wed, 25 Oct 2006 12:30:10 -0400, Richard Heritage <[EMAIL PROTECTED]> wrote: >I know this is an "it depends" question, but I hope some of you can give >me a very general answer. As an MVS guy, I'm used to being able to run >the processor very close to or even at 100% without significant >performance degradation. Assuming that everything is configured and >tuned properly (a big assumption, I know), can VM drive the processor >the same way? Our application people are used to other platforms that >don't tolerate high CPU utilization so well and think things are going >to start falling apart when we hit 80%. I'd like to reassure them--but >only if it's accurate to do so! This is a WebSphere application running >on multiple SUSE instances, with the data on DB2 under z/OS. Is it >reasonable for me to expect--again, assuming everything else is >right--to be able to run at 90+ percent without problems? > > > >Richard Heritage >Lead Systems Software Engineer >IT @ Johns Hopkins >======================== ========================= ========================
