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

[Thomas Halinka <lists@xxxxxxxxx>]

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
> 
> 
> > -----UrsprÃngliche Nachricht-----
> > Von: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] Im Auftrag von 
> > Thomas Halinka
> > Gesendet: Freitag, 6. MÃrz 2009 09:35
> > An: Brad Plant
> > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > 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@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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