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

To: <xen-users@xxxxxxxxxxxxxxxxxxx>, "James Pifer" <jep@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Do systems have to be IDENTICAL for live migration?
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Wed, 07 Jul 2010 08:53:47 -0600
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>>> On 2010/07/07 at 06:21, James Pifer <jep@xxxxxxxxxxxxxxxx> wrote: 
> On Thu, 2010-07-01 at 21:01 -0400, James Pifer wrote:
>> I have several systems running 64bit SLES11SP1. I'm trying to Live
>> Migrate between a couple of them and it's not working, although the
same
>> VM will run on each one starting it manually. 
>> 
>> The system are not identical. Would one expect migration to work
>> between these two systems? See below. 
>> 
>> Thanks,
>> James
> 
> Just an update to this. I can migrate from the DL360 G5 (8 CPU) to
the
> DL360 G6 (16 CPU) but not the other way around. 
> 
> Is that expected? Is the CPU count the issue possibly?
> 
> Thanks,
> James

Could you more clearly define "not working" - error messages, log
entries, etc.?  Sometimes CPU differences can prevent live migration
from working properly, but there are other factors, too.  It would be
useful to know what Xen says about why live migration is failing.  Also,
could you specify exactly what CPUs are in those boxes?  I don't use HP,
but I know with Dell servers the model/generation of server you're using
can have a wide range of processors in it, so just specifying the server
model/brand does not really tell anything useful.

-Nick


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