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

[Thomas Halinka <lists@xxxxxxxxx>]

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@xxxxxxxxxxx> 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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