On 12 Apr 2018, at 18:26, Stefano Stagnaro <stefanos@prismatelecomtesting.com> wrote:
Hi,

I recently upgraded an oVirt deployment from 3.6 to 4.0 and then 4.1.9 (my actual release). Since then, when migrating many hosts simultaneously I always experience few migrations failure like 1 on 10 vms. The failure can occur on any host; moreover, after a couple of failure the destination host fall in Error status and I have to manually re-activate or wait 30 min.

Tipical error found on vdsm log is (from the source host):
2018-04-12 17:01:32,097+0200 ERROR (migsrc/3192dfe7) [virt.vm] (vmId='3192dfe7-eeac-4626-8c86-e49facc9006f') migration destination error: Fatal error during migration (migration:287)

Please find the logs of source host (v15.ovirt), destination host (v14.ovirt) and engine here: https://www.dropbox.com/sh/xhf8ry4ih40poxd/AABxiFCIxDe14HSx2DqLE61ya?dl=0

Some of the vm affected from the migration failure are:
svn 3192dfe7-eeac-4626-8c86-e49facc9006f
wood a8e83ff0-dfed-4074-b6b6-e947b8ebb952
qnx66 5697c4a4-9e40-4dd6-aba2-c8ab9904a584

can you also include qemu log from /var/log/libvirt/qemu/<vmname>?