Re: qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions

[Lucas Meneghel Rodrigues <lmr@redhat.com>]

On 11/09/2011 05:25 PM, Juan Quintela wrote:
> Lucas Meneghel Rodrigues<lmr@redhat.com>  wrote:
>> Hi guys, here I am, reporting yet another issue with qemu. This time,
>> it's something that was first reported in January, and Juan proposed a
>> patch for it:
>>
>> http://comments.gmane.org/gmane.comp.emulators.qemu/89009
>>
>> [PATCH 4/5] Reopen files after migration
>>
>> The symptom is, when running disk stress or any intense IO operation
>> in guest while migrating it causes a qcow2 corruption. We've seen this
>> consistently on the daily test jobs, both for qemu and qemu-kvm. The
>> test that triggers it is autotest stress test running on a VM with
>> ping-pong background migration.
>>
>> The fix proposed by Juan is on our RHEL branch and such a problem does
>> not happen on the RHEL branch. So, what about re-considering Juan's
>> patch, or maybe work out a solution that is satisfactory for the
>> upstream maintainers?
>>
>> I'll open a launchpad bug with this report.
>
> I have just sent:
>
> [RFC PATCH 0/2] Fix migration with NFS&  iscsi/Fiber channel
>
> Only the 1st patch on that series are needed to fix that problem.  Could
> you try it?

Just tried it, it conclusively fixes the corruption problems. Reported 
it on the patch email.

> Thanks, Juan.