On 11/09/2011 10:29 AM, Lucas Meneghel Rodrigues 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
Migration with qcow2 is not a supported feature for 1.0. Migration is only
supported with raw images using coherent shared storage[1].
[1] NFS is only coherent with close-to-open which right now is not good enough
for migration.
Regards,
Anthony Liguori
[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.
Thanks,
Lucas
