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

Rustedt, Florian
Fri, 06 Mar 2009 08:07:27 -0000

No, just paras.
Could  that help?

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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