Comment 0 for bug 1627476

Detailed bug description:
 during "boot_attach_live_migrate_and_delete_server_with_secgroups" rally scenario few LiveMigration steps have been failed. From rally logs: http://paste.openstack.org/show/582875/
From nova-compute.log on node-675: http://paste.openstack.org/show/582876/
Steps to reproduce:

1. Deploy Fuel 9.0 from fuel-9.0-mos-495-2016-06-16_18-18-00.iso
2. Update Fuel to 9.1:
yum-config-manager --add-repo http://mirror.fuel-infra.org/mos-repos/centos/mos9.0-centos7/snapshots/proposed-2016-09-15-134324/x86_64/
rpm --import http://mirror.fuel-infra.org/mos-repos/centos/mos9.0-centos7/snapshots/proposed-2016-09-15-134324/RPM-GPG-KEY-mos9.0
yum install -y python-cudet
yum clean all
update-prepare prepare master
update-prepare update master
3. Applying nailgun patch due to bug https://bugs.launchpad.net/fuel/+bug/1596987:
yum -y install patch && curl -s 'https://review.openstack.org/gitweb?p=openstack/fuel-library.git;a=patch;h=15bd6cd3ed4b7b8a42da47d19e9ed1eb4700e7d3' | patch -b -d /etc/puppet/modules/ -p3
4. fuel rel --sync-deployment-tasks --dir /etc/puppet/
5. Create config for nailgun-agent
mkdir /usr/share/fuel_bootstrap_cli/files/trusty/etc/fuel-agent
curl -s 'http://paste.openstack.org/raw/506300/' > /usr/share/fuel_bootstrap_cli/files/trusty/etc/fuel-agent/fuel-agent.conf
6. fuel-bootstrap build --verbose --debug --activate --label 'replaced-nailgun-agent_fixed'
7. Create cluster with 3 controllers, 20 osd( both baremetal) and 1000 computes(qemu-kvm)
8. Create additional repo for cluster "mos9.0-proposed":
name: mos9.0-proposed
uri: deb http://mirror.fuel-infra.org/mos-repos/ubuntu/snapshots/9.0-2016-09-15-162322/ mos9.0-proposed main restricted
priority: 1200
9. Fix syslog NOFILE limit, due to bug https://bugs.launchpad.net/fuel/+bug/1626092
On fuel node create file /etc/systemd/system/rsyslog.service.d/limits.conf with content:
[Service]
LimitNOFILE=16384
10. deploy the following cluster:
3 harware controllers, 20 hardware Ceph OSDs, 1000 virtual computes(KVM, 7VMs per hypervisor host),
vxlan+dvr, Ceph for all, OpenStack and deployment debug enabled
Expected results:
 The test has passed
Actual result:
 The test has failed
Reproducibility:
 tried once
Workaround:
 not yet
Impact:
 if you'll use 1000-node cluster, spawning and migrating 5 instances at the same time, live migration can be failed.
Description of the environment:
- Operation system: Ubuntu
- Versions of components: MOS 9.1 (9.0-2016-09-15-162322)
- Reference architecture: 3 harware controllers, 20 hardware Ceph OSDs, 1000 virtual computes(KVM, 7VMs per hypervisor host), Ceph for all, OpenStack and deployment debug enabled
- Network model: vxlan+dvr
- Related projects installed: -
Additional information:
 Logs from fuel node:
 Logs from node-675: