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

  • To: "Claris Castillo" <ccastil@xxxxxxxxxx>
  • From: mail4dla@xxxxxxxxxxxxxx
  • Date: Wed, 25 Jul 2007 10:50:25 +0200
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 25 Jul 2007 01:48:14 -0700
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the technique that you suggest is in my opinion only suited to protect from hardware failure.
If within your DomU, something bad happens with your software, you run the risk that the condition that finally leads to the failure has already occured when you snapshot your running DomU. Thus, it is quite likely that the restarted DomU will also fail.


On 7/25/07, Claris Castillo <ccastil@xxxxxxxxxx> 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
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.
Could this technique be leveraged to perform a hot backup? If so, why Xen
does not provide with hot
backup yet? I have been experimenting with VMWare and the performance is
pretty bad since
it uses REDO files.

By the way I tried doing local live migration and I got  *several * error
messages. I am not sure if the errors
have to do with the fact that it is not possible to perform a  local live
migration or some other technical issues
I can solve if I look at it.

I would appreciate any suggestions/advice in this regard.

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