On Thursday, 07/27/2006 at 02:46 AST, David Boyes <[EMAIL PROTECTED]> wrote: > > > >Then again, if you have a z9, you probably don't much care. 8-) > > what about performance and CPU overheads (zVM) in processing I/O's, is > > it an issue? > > It (the difference between dedicated and minidisk I/O) is measurable, > but the impact is smaller on the z9 systems due to the increased > processor speed. > > I'm sure the Velocity folks will chime in with more details.
I/O assist was only available with V=R and V=F guests while running in basic mode, so any improvement was limited to those 6 virtual machines. For a Linux farm, the vast majority of guests (V=V) never benefitted from I/O assist. And starting with the z990 there is no basic mode, so even the Big Six get no benefit. That, plus the removal of preferred guest support (V=R and V=F) from z/VM V5, the loss of I/O assist on the processor doesn't mean much. Alan Altmark z/VM Development IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
