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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