Re: [Xen-users] Xen 4.0 - prerequisites for succesfull live migration?

[Danilo Godec <danilo.godec@xxxxxxxxx>]

On 07/07/2011 11:32 AM, Mark Dokter wrote:
> I had migration and save/restore issues with xen 4.0 on debian and 
> ubuntu. (See thread "Live migration on xen 4.0.1 fails" on this list 
> (dated 04/2011). I did not really find out, what went wrong. Now I use 
> xen 4.1 and migration works (with 2.6.38+ pv-on-hvm domUs).
Thanks, I'll try to setup a lab to test 4.1...

But in the mean time I made some discoveries:

I'm using the 'vcpus=X' and 'vcpu_avail='Y' to start my VM's with 'Y' 
VCPU's, but still be able to add some VCPU's later if needed (where X is 
the number of cores in my biggest server and Y is typically 2).
In this case, live migration fails.

If I omit the 'vcpu_avail' option and only use 'vcpus=Y',  live 
migration seems to work. However 'xm console' doesn't work after 
migration and
'xm shutdown' doesn't work either  - instead the CPU usage according to 
xentop shoots up to 100% and ultimately the DomU has to be destroyed.
   Danilo

PS: I'm using para-virtualisation. Would I be better off using HVM?


> > So this is the first problem. I wonder if there is a known problem
> > with this specific Xen version or something specific to your setup on
> > OpenSUSE?
> >
> > I've added the opensuse-virtual list to the CC just in case someone
> > can shed some light on it. (here is this message in context
> > http://lists.xensource.com/archives/html/xen-users/2011-07/msg00090.html)
> >
> > Thanks,
> > Todd
> regards,
>
> Mark
>
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--
Danilo Godec, sistemska podpora / system administration

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