[nova][neutron][ptg] Nova - Neutron cross project dicussions

Bal√°zs Gibizer balazs.gibizer at est.tech
Sun Nov 10 16:35:40 UTC 2019


https://etherpad.openstack.org/p/ptg-ussuri-xproj-nova-neutron

Nova-Neutron live-migration - ACTIVE/INACTIVE port bindings issue
* nova needs vif plug event for inactive bindings
* live migration with ml2-ovs only works by luck
* agentless drivers does not support this
  https://bugs.launchpad.net/neutron/+bug/1834045
  https://bugs.launchpad.net/neutron/+bug/1840147

Agreements:
* document the nova-neutron live migration workflow to create a common 
base
  for discussion. Add ijw and sean-k-mooney to the review


SR-IOV live migration utilizing kernel NET_FAILOVER feature
* aim to support live migration with SRIOV nic without traffic 
interrupt by bonding a virtio interface to the SRIOV nic in the guest 
kernel with NET_FAILOVER.
* https://www.kernel.org/doc/html/latest/networking/net_failover.html
* There was multiple solution proposlas but no agreements about which 
one to pursue.
* TODO: adrianc to propose a nova spec based on the discussion


Correlation of Bandwidth RP with PCI RP when PCI will be tracked in 
Placement
* Early heads up to Neutron team that Nova things about modelling PCI 
in Placement
* Current best thinking on Nova side is to correlate BW RP with PCI RP 
in placement with a placement aggregate.
* Nova will do the correlation
* Neutron needs to prepare for possible BW RP generation conflict
* Agreement: Neutron is OK with this plan. rubasov can help with the 
neutron impact when nova makes progress.






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