Re: KVM live migration i/o error

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On Wed, Mar 18, 2015 at 04:53:28PM +0100, Francesc Guasch wrote:
> I have three Ubuntu Server 14.04 trusty with KVM. Two of
> them are HP servers and one is Dell. Both brands run fine
> the KVM virtual servers, and I can do live migration between
> the HPs. But I get I/O errors in the vda when I migrate to
> or from the Dell server.
> 
> I have shared storage with NFS, mounted the same way in all
> of them:
> 
>     nfs.sever:/kvm /var/lib/libvirt/images nfs auto,vers=3
> 
> I checked the version of all the packages to make sure are
> the same. I got:
> 
>     kernel: 3.13.0-43-generic #72-Ubuntu SMP x86_64 libvirt:
>     libvirt: 1.2.2-0ubuntu13.1.9 
>     qemu-utils: 2.0.0+dfsg-2ubuntu1.10
>     qemu-kvm: 2.0.0+dfsg-2ubuntu1.10
> 
> I made sure the Cache in the Storage is set to None.
> 
>     Disk bus: virtio Cache mode: none IO mode: default
> 
> I run this to do live migration:
> 
>     virsh migrate --live virtual qemu+ssh://dellserver/system
> 
> As soon as it starts in the origin console I spot I/O error
> messages, when it finishes I got them in the console in the
> destination server. The file system is read only and I have to
> shut it down hard.
> 
>     end request I/O error, /dev/vda, sector 8790327

"origin console" == guest's console?

I/O errors starting while the guest is still running on the migration
source host is strange.  I wonder if something happened to the NFS file
related to file permissions or SELinux labels?

Stefan

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