Re: [Xen-devel] New feature support - xl or xm ?

["Vincent, Pradeep" <pradeepv@xxxxxxxxxx>]

Thanks Stefano.

>>I think that migrating VMs from 'xm hosts' to 'xl hosts' would
> work even at the moment, if you use xl on both source and destination
> hosts 


I am not sure what you meant here ­ Are you suggesting retrofit of Oxl¹ to
hosts using older hypervisor.

Can migration functionality (including live migration) in Oxl¹ be designed
for backward compatibility with Oxm¹. I am sure this will go a long way in
helping existing users convert over to Oxl¹.

- Pradeep Vincent



On 6/8/10 2:17 AM, "Stefano Stabellini" <stefano.stabellini@xxxxxxxxxxxxx>
wrote:

> On Tue, 8 Jun 2010, Vincent, Pradeep wrote:
>> I haven¹t looked deeply into Oxl¹ but..
>> 
>>> From the recent Xen summit, I walked away thinking Oxl¹ didn¹t have the
>>> callback mechanisms (e.g. Cleanup etc) and this
>> helped it stay stateless while falling short of full Oxm¹ replacement. This
>> email thread indicates Oxm/xend¹ will be
>> deprecated in due course of time. Did I miss anything here ?
>> 
> 
> We intend to port xend to libxl at some point to smooth the migration
> path, however xl is going to be where most of the development and
> testing is going on, so it is worth considering a switch to xl in any
> case.
> xl does have the callback mechanisms for cleanup, they are implemented
> in a per-VM daemon that is started when you create the domain.
> However you can still create a VM without starting the related daemon
> (no callbacks or cleanups in that case).
> 
> 
>> Is migration of VMs from Oxm¹ managed hosts to Oxl¹ managed hosts expected to
>> work ?
>> 
>> I think moving away from commonly used xend/xm could be a bit of a thorn
>> particularly if the Oxm¹ to Oxl¹ migration isn¹t
>> expected to work.
>> 
>> Thoughts ?
>> 
> 
> There are only two things that xl doesn't have compared to xend: the
> concept of managed domains (domains that are installed on your system
> and may be offline) and an XML-RPC interface.
> If you don't need these two things than switching shouldn't be
> difficult.
> I think that migrating VMs from 'xm hosts' to 'xl hosts' would
> work even at the moment, if you use xl on both source and destination
> hosts and specify the configuration file you used to create the domain
> at the source. In any case it could be made to work without too many
> efforts, given that your are not speaking about fully managed domains.
> 


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