[libvirt-users] migration job: unexpectedly failed

[Daniele]

Hi Eric, so I will try to downgrade libvirt in the source host back to the
0.9.8 version. To completely remove libvirt is enough to run the apt-get
command with the purge option?

Same thing also for the qemu packet?

Thanks
Daniele


2013/5/7 Eric Blake <eblake at redhat.com>

> On 05/07/2013 10:58 AM, Daniele wrote:
> > Thanks for your answer
> >
> >>> The live wide migration from A to B completes successfully, instead I
> >> can't
> >>> achieve the reverse path, from B to A (and that is right what I am
> >>> interested to). To perform the migration I run this command in virsh:
> >> *"migrate
> >>> --live --verbose uno qemu+ssh://root@ip.address/system"*
> >>
>
> > In the source host there is libvirtd 0.9.12, while in the destination
> host
> > there is a modified version of the 0.9.8 (that I can't change).
>
> There's your problem.  In general, migration is backwards-compatible
> (old going to new should work; if it doesn't, that's a bug we are
> prepared to fix), but not forwards-compatible (there's no way we can
> ever commit to guaranteeing that new->old will work in all scenarios).
> Your best bet for successful migration is to have the same version of
> software on both sides of the equation, or to be prepared for only
> old->new to work.  Your failure appears to be because you are trying
> new->old.
>
> > Nothing interesting in the source uno.log, but I wasn't checking in the
> > destination host log. These are its last lines:
> > *savevm: unsupported version 3 for 'i8254' v2*
> > *load of migration failed*
> > *2013-05-07 16:27:59.682+0000: shutting down*
> >
> > I'm also checking the libvirtd.log in the destination host (that i didn't
> > look before) and it seems interesting. It reports this error:
> > *2013-05-07 16:27:59.682+0000: 16651: error : qemuMonitorIO:560 :
> internal
> > error End of file from monitor*
> > *Caught Segmentation violation dumping internal log buffer:*
>
> Yep, when migrating from new to old qemu, the new qemu was sending stuff
> the old one choked on.
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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