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

Rustedt, Florian
Fri, 06 Mar 2009 13:41:22 -0000

Could you please, please be so kind to zip the plain sources for me?
As mentioned, if you want, i could provide an ftp-dir for that?

> -----Ursprüngliche Nachricht-----
> Von: Thomas Halinka [mailto:lists@thohal.de]
> Gesendet: Freitag, 6. März 2009 14:39
> An: Rustedt, Florian
> Cc: xen-users@lists.xensource.com
> Betreff: Re: AW: [Xen-users] Reverse migration breaks/freezes VM
>
> Hi Florian,
>
> you dont need any patches for pv_ops, just alter the
> kernel-config for xen.
>
> I am using 2.6.26 from lenny (with some patches), which works
> fine for me in Production.
>
> Running a cluster with roundabout 4500 Servers with xen and
> it s rock-solid ;)
>
> regards,
>
> thomas
>
>
>
>
> Am Freitag, den 06.03.2009, 11:56 +0100 schrieb Rustedt, Florian:
> > Hi Thomas,
> >
> > can you give me a hint, how i can get a complete
> xen-patched source-tree for 2.6.28(.xx)?
> > Or a xen patch-set for vanilla-sources?
> > Or even better, is there perhaps a way for you to give me
> your kernel-source tree as download? Then i've got exactly
> the same version and can be sure to exclude this topic as
> failure source..?
> > I could provide a ftp-upload location for that, if that helps?
> >
> > Of course i read this:
> > http://wiki.xensource.com/xenwiki/XenParavirtOps
> >
> > But then i would have a 2.6.29 kernel and for now it would
> be better, if i get exact your version that is known to work...?
> >
> > Cheers, Florian
> >
> >
> > > -----Ursprüngliche Nachricht-----
> > > Von: xen-users-bounces@lists.xensource.com
> > > [mailto:xen-users-bounces@lists.xensource.com] Im Auftrag
> von Thomas
> > > Halinka
> > > Gesendet: Freitag, 6. März 2009 09:35
> > > An: Brad Plant
> > > Cc: xen-users@lists.xensource.com
> > > Betreff: Re: [Xen-users] Reverse migration breaks/freezes VM
> > >
> > > Hi Florian,
> > >
> > > Full ACK to Brad,
> > >
> > > kick the 2.6.27-Kernel. We have some kernel-gurus in here
> and they
> > > will tell you the same. Try 2.6.26 or 2.6.28 and it
> should work....
> > >
> > > Best regards,
> > >
> > > Thomas
> > >
> > >
> > > Am Freitag, den 06.03.2009, 11:09 +1100 schrieb Brad Plant:
> > > > Hi Florian,
> > > >
> > > > I was unable to successfully migrate VMs running a 2.6.27
> > > kernel. I found that the network would stop working on the first
> > > migration and then the disk IO would stop when migrating
> the machine
> > > back again (which made processes block waiting for disk IO and
> > > therefore the machine appear to hang).
> > > >
> > > > Try a 2.6.28 kernel. It seems to have sorted out my issues.
> > > >
> > > > Cheers,
> > > >
> > > > Brad
> > > >
> > > >
> > > > On Thu, 5 Mar 2009 14:12:56 +0100
> > > > "Rustedt, Florian"
<Florian.Rustedt@smartnet.de> wrote:
> > > >
> > > > > 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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