I'd reiterate what David Kreuter said: With sufficient storage and a reasonably well-configured I/O subsystem, you should be able to sustain 90% or greater CPU busy without impacting guest response time. Note that those are not trivial provisos.
Marty ____________________ Martin Zimelis Principal maz/Consultancy > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of Richard Heritage > Sent: Wednesday, October 25, 2006 12:30 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: CPU Utilization Limit > > 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 >