Re: [Xen-users] Hot backup vs (local) live migration

[Tom Brown <xensource.com@xxxxxxxxxxxxxxxxxxx>]

On Tue, 24 Jul 2007, Claris Castillo wrote:

> Hi, this is the third time I post this question to the list but I have not
> received any response.
>
> It is not clear to me why the live migration technique used by Xen and
> documented at
> http://www.cl.cam.ac.uk/research/srg/netos/papers/2005-migration-nsdi-pre.pdf
> can't be used to perform a hot backup of a virtual machine. Based on the
> paper, just  before
> shutting down and destroying the original VM, there is an exact clone of it
> in the remote/destination host.
I haven't looked at that PDF, but there's nothing magic about a migration. 
It copies the memory and CPU state of the guest. In short I copies 
everything you generally would not back up (memory and cpu state), and 
copies nothing that normally you would backup (no files have been copied).
-Tom

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