KVM guest Buffer I/O errors

[Serge Hallyn]

Quoting Matej (matej at matnet.net):
> Hi,
> 
> I have an issue which is very similar to some others that I found
> unsolved, such as:
> - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/577785
> - http://centos.distrosfaqs.org/centos-virt/guests-pausing-suddenly/
> - http://ubuntuforums.org/archive/index.php/t-1450439.html
> 
> I have 8 guests installed on an internal RAID and all of them work
> as they should, except one (that is the largest of them and sadly,
> the most important one). There are no drive problems reported in
> none of the other host's logs. The most importantly, there is
> nothing in the host system logs at all, but although it is so, we
> have replaced both drives by new ones just out of the box. But the
> issue remains so I am pretty sure it's now hardware-related, but
> have no more ideas what to do next. I could just create a new guest
> and transfer the services and data, but since this happened without
> me changing anything (at least intentionally), I want to find out a
> reason why did it actually happen and how to prevent it.
> 
> Any help or ideas on this matter are very welcome.
> 
> Thanks,
> Matej

Best would be to file a bug against linux plus qemu-kvm so we can
collect more information.  Are you using soft or hard raid?  Which
release are you on?  Is it possible to test with raid out of the
picture?