I would agree with the comments in favour of VirtualBox and KVM.  Used lots of 
both of them and RHEL6 (or Scientific Linux 6 in my home system's case) runs 
quite well in it.  No problem running 4-5 of them at one time on a moderately 
powerful desktop system.  However that's only console and no GUI.  I have no 
experience (yet) with Xen.

David

---
David J. Veer
RHCSA, CCNA, Network+
[email protected]

On 2012-05-19, at 1:39 PM, Tom Limoncelli wrote:

> On Sat, May 19, 2012 at 2:11 PM, Andrew Hume <[email protected]> wrote:
>> any recommendations for/against any particular flavour of VM?
>> i will most likely be running RHEL6 inside them, but may be not.
> 
> Red Hat is in the KVM camp.  Canonical is in the Xen camp.  You'll get
> better support if you stay within your camp.
> 
> One nice thing about KVM is that each virtual machine is a Unix
> process.  You can "kill -9", so to speak, the entire machine.  (More
> importantly, you can strace it, and so on).
> 
> Currently they have approximately the same performance.  If you need
> to squeeze the last bit of performance out of them then you'll have to
> benchmark both for your application to see which works best.  On the
> other hand, if you are that concerned about performance then you
> should be using bare metal :-)
> 
> 
> By the way... there are systems that will manage large groups of KVM
> or Xen VMs for you.  I am involved in an open source project called
> Ganeti which will manage clusters of either.
> http://code.google.com/p/ganeti
> 
> 
> Tom
> 
> -- 
> http://EverythingSysadmin.com  -- my blog
> http://www.TomOnTime.com -- my videos
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