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RE: [Xen-users] How many guest hosts per physical host

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] How many guest hosts per physical host
From: Nathan Eisenberg <nathan@xxxxxxxxxxxxxxxx>
Date: Fri, 18 Dec 2009 16:57:47 -0800
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Thread-topic: [Xen-users] How many guest hosts per physical host
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Florian Gleixner
> Sent: Friday, December 18, 2009 3:53 PM
> To: Grant McWilliams
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] How many guest hosts per physical host
> Grant McWilliams wrote:
> > I have one machine that's an 8 core Xeon (32 GB ram) and am running
> 42
> > Full CentOS 5.4 PV DomUs with Guis and 512 MB ea. The first 10 take
> If you use the same linux distro and version on every virtual machine,
> you can handle much more machines if you use other virtualisation
> technology like virtuozzo, openvz, vserver or the new lxc containers.
> The last one is integrated in recent kernel as far as i know.
> These all run all VMs on one kernel. The VMs have no own kernel and
> therefore you can share memory. You can also share filesystem caches if
> you bind mount parts of your host installation. With that you can
> really run hundreds of virtual machines with your hardware.
> Drawback: Running different operating systems is nearly impossible.
> Patching is hell.
> But it should be possible to use both: xen and lxc. Opensuse 11.2 Xen
> kernel has lxc requirements compiled in.
Incidentally, I use Virtuozzo for Windows 2003 virtualization.  I get 
absolutely AMAZING density on it, way better than I could get with Xen.  It's 
also expensive, and there's very little user community if you have problems.

Best Regards,
Nathan Eisenberg
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