Description of problem: It is often noticed in scale environments that ovn migration script in TASK “Updating the overcloud stack with OVN services” takes too long and fail with timeout. An example of the timeout looks like below: http://perf1.perf.lab.eng.bos.redhat.com/pub/jaison/upgrades-osp13-16.1.1/osp16/backup/stack/tmux/ml2-ovs_ovn-migration-tmux.log sed -n '5876,5878p' ml2-ovs_ovn-migration-tmux.log | less A rerun of the script fails with error from TASK “Updating the overcloud stack with OVN services” fails if there is an ongoing config download in progress. “"Config download already in progress with execution id 617bb1ac-e013-4c36-b399-a2deecfa24dd for stack overcloud" . We need the migration script/playbook to be smart enough to understand if an update is running from past attempt and wait to continue after the stack update is complete.
workaround available. not a blocker for OVN migration