Re: AW: [Xen-users] Reverse migration breaks/freezes VM

Thomas Halinka
Fri, 06 Mar 2009 08:35:43 -0000

Am Freitag, den 06.03.2009, 09:07 +0100 schrieb Rustedt,
Florian:
> No, just paras.
> Could  that help?

nope - try other kernel than 2.6.27...

Use 2.6.26 or 2.6.28 instead and it should work. We have some
kernel-gurus here and they will tell you the same.

Regards,

Thomas
>
> Florian
>
> > -----Ursprüngliche Nachricht-----
> > Von: James Harper [mailto:james.harper@bendigoit.com.au]
> > Gesendet: Freitag, 6. März 2009 00:57
> > An: Rustedt, Florian; xen-users@lists.xensource.com
> > Betreff: RE: [Xen-users] Reverse migration breaks/freezes VM
> >
> > Are they HVM domains?
> >
> > James
> >
> > > -----Original Message-----
> > > From: xen-users-bounces@lists.xensource.com [mailto:xen-users-
> > > bounces@lists.xensource.com] On Behalf Of Rustedt, Florian
> > > Sent: Friday, 6 March 2009 00:13
> > > To: xen-users@lists.xensource.com
> > > Subject: [Xen-users] Reverse migration breaks/freezes VM
> > >
> > > Hello list,
> > >
> > > I''ve got strange phenomenons with migrations. I think
it''s
> > a bug, but
> > am
> > > not sure, so i am asking for your help to find this ou, please ;)
> > >
> > > First the construct:
> > > Two HP DL180G5(xen0,xen1) with dual-quadcore each, 8G RAM.
> > >
> > > On each a dom0 with selfcompiled(because of network drivers)
gentoo-
> > > sources-xen-2.6.27_amd64 and Xen 3.3.0. The installation is
> > completely
> > the
> > > same (rsynct), only different in ip and hostname.
> > >
> > > Both share a drbd0(v8.3.0) device. On it an lvm with one lv per
vm.
> > >
> > > Now what''s the problem:
> > >
> > > If i migrate a running vm(mx1-smartnet-de) from xen0 to
> > xen1, it seems
> > to
> > > work.
> > > I could do a "xm migrate mx1-smartnet-de xen1" without
any
> > interuption
> > > while having a ssh-connection to the vm and downloading a
> > kernel-source in
> > > it.
> > >
> > > Then i did a "xm migrate mx1-smartnet-de xen0" on xen1
to
> > move it back
> > > again. After that, the vm freezes at 100%CPU and that''s
it! Can''t
> > connect
> > > to it any more, whether via ssh nor via vnc/fb or console. Only
"xm
> > > destroy" could help, "xm shutdown" has no impact.
> > >
> > > For debugging, i added the concerning parts of the xend.log
> > from each
> > and
> > > the kernel-configs, so that you could try to help me find the
prob
> > perhaps
> > > in the logs?
> > >
> > > Just after having started the vm:
> > > xen0_after_start_of_vm.log
> > >
> > > Then after the first migration:
> > > xen0_after_migrate_to_xen1_of_vm.log
> > > xen1_after_migrate_to_xen1_of_vm.log
> > >
> > > And last, after the reverse:
> > > xen0_after_migrate_back_from_xen1_of_vm.log
> > > xen1_after_migrate_back_from_xen1_of_vm.log
> > >
> > > I don''t believe it is a drbd/lvm problem, because drbd
keeps in "0:
> > > cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C
> > r---" and there
> > are
> > > no lv-concerning log-entries in syslog.
> > >
> > > There are of course errors concerning "retry suspend domain
failed",
> > but
> > > there''s no hint, WHY this has got failed?
> > >
> > > Kind regards, Florian
> > >
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