On 06/08/2011 09:13 AM, Einar S. Idsø wrote: > Hi Eric, > > On Wed, Jun 8, 2011 at 4:33 PM, Eric Shubert <ejs at shubes.net > <mailto:ejs at shubes.net>> wrote: > > Is your goal absolute best performance (why?), or simply adequate > performance? > > > The hardware available to us is quite old, so pushing performance is > absolutely the key issue. Stability/reliability and ease of maintenance > are of course also factors. But since I've not have any bad experiences > with OpenVZ in those respects, and I expect Xen to be at least as good, > it pretty much comes down to performance. > > I wouldn't expect to see Xen outperform OpenVZ. However, if your CPU has > has virtualization extensions, I would expect performance to be pretty > close between the two. > > > Unfortunately it doesn't. We're doing a "parallell shift" from a host > with 2xOpteron 250 (2.4GHz) to another host with 8xOpteron 880 (also > 2.4GHz but dual-core), so apart from the increase in number of cores > from 2 to 16 and amount of RAM from 6 to 32GB there's no real difference > to be found. But since we're transitioning anyway, we're giving > alternative technology a consideration. > > But okay, are you saying that Xen will at best be as good as OpenVZ > using this hardware, This is my expectation. I don't know of any reason why Xen would perform better than OpenVZ in this situation. Someone may know better than I do about this though. I would hope they'd chime in here if they do. > and there's really not much point in me spending > time learning Xen and running performance tests? That would save me > quite a few workdays :) I'd go this route, sticking with OpenVZ. Unless you've nothing better to do. ;) > That being said, if you're considering Xen, I'd give strong > consideration to KVM as well. > > > Thanks, I already looked at KVM, but it seems to require the > virtualization bit, which means it is not an option for us. If/when the time comes when you're migrating to hardware that supports virtualization, I'd give KVM strong consideration. > Thanks for your input, Eric, it is much appreciated :) Sure. Just don't hang me if/when I'm wrong. ;) -- -Eric 'shubes'