RE: [Xen-users] Do systems have to be IDENTICAL for live migration?

["Dustin Henning" <Dustin.Henning@xxxxxxxxxxx>]

        I thought it was discussed in a previous thread that as long as all
processors have the same capabilities (additional capabilities being
irrelevant) as the processor that the VM started on a live migration would
be fine.  It could be that the destination processor has to have the same
capabilities as the current processor regardless of whether or not this was
the processor the VM was originally started on (again, additional
capabilities would be irrelevant, not assisting or preventing in the
migration).  However, the thread I refer to would have some age (months to
years) on it, and it may have been related to a previous Xen limitation vs a
processor limitation as is now being discussed.
        Dustin

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Bart Coninckx
Sent: Thursday, July 08, 2010 05:01
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: Ravi Giri
Subject: Re: [Xen-users] Do systems have to be IDENTICAL for live migration?

On Thursday 08 July 2010 10:37:05 Ravi Giri wrote:
> On Wed, Jul 7, 2010 at 10:45 PM, James Pifer <jep@xxxxxxxxxxxxxxxx> wrote:
> 
> AFAIK, Intel processors with 'FlexMigration' support allow live
> migration across different processor generations
> 
> > Server1 (x16)
> > model name      : Intel(R) Xeon(R) CPU           E5540  @ 2.53GHz
> 
> Xeon 5500 series (this is obviously the G6 system) has FlexMigration
> 
> > Server2 (x8)
> > model name      : Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz
> 
> Xeon 5400 series (this is obviously the G5 system) does not have
>  FlexMigration
> 
> That's why you're able to livemigrate from G5 to G6 and not the other way.
> 
> FlexMigration essentially allows live migration across processors even
> with some differences in instruction sets.
> 
> This is specific to the processor though, there may be other
> dependencies with respect to the rest of the server platform that
> could cause livemigration between two dislike systems to fail.
> 
> Regards,
> --
> Ravi
> 
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> http://lists.xensource.com/xen-users
> 

I'm live migrating in between a HP DL 380 G6 machine and an old Dell
Poweredge 
860 that has no FlexMigration (AFAIK). This is on Xen 3.2 though.

B.


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