[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

  • To: Claris Castillo <ccastil@xxxxxxxxxx>
  • From: Luiz Vitor Martinez Cardoso <grabber@xxxxxxxxx>
  • Date: Wed, 25 Jul 2007 12:00:59 -0300
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 24 Jul 2007 23:00:16 -0700
  • Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:date:from:to:cc:subject:message-id:in-reply-to:references:x-mailer:mime-version:content-type:content-transfer-encoding; b=WyD8xy2Lf7f+jb7oZpFjFRZ77si1SSDiiuUyTk+FcIrbuCE+vZZ7FKeLxsZqz9527kIKrDAj1wvMgapIy8vK8ueywKIUgE465uC1zuJyTEySdBJszIgQcePMOVxTgBKXllimHGTqrFGlna0JrJ+64wvPUxLTK822R6707VuJcIc=
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>


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.



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
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.