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

[Luiz Vitor Martinez Cardoso <grabber@xxxxxxxxx>]

Hi,

First i have a question! Why you need make a memory-ram backup? I read your 
text and don`t understand what you are saying exact. The live migration 
algoritms "only" manage the data from memory-ram, the data from HD need to be 
managed with drdb, iscsi... when we need to backup a xen machine just a 
image/lvm/evms needs to be backuped.

Regards,

Grabber.

Em Tue, 24 Jul 2007 21:47:44 -0400
Claris Castillo <ccastil@xxxxxxxxxx> escreveu:

> 
> 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.
>  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.
> cc
> 
> 
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