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[Launchpad Bug Tracker <1782119@xxxxxxxxxxxxxxxxxx>]

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1782119

Title:
  Downtime of volume backed live migration between two compute nodes
  (different version: liberty-mitaka) is too high

Status in OpenStack Compute (nova):
  Expired

Bug description:
  Hi everyone,

  I'm working on upgrading OpenStack from Liberty to Mitaka. I've upgraded my controller to mitaka. Mitaka controller will manage liberty computes and mitaka computes. After that I do live migration VMs from liberty compute to mitaka compute. when live migrate between two computes different version, I recognized downtime was too high (30 ICMP packets loss with 200ms interval) than two computes same version (5 ICMP packets loss with 200ms interval), summary:
  live-migration between liberty-liberty computes: 5 ICMP packets loss with 200ms interval
  live-migration between liberty-mitaka computes: 30 ICMP packets loss with 200ms interval
  I don't know why it happened

  My ENV:
  1 controller mitaka
  2 compute liberty
  1 compute mitaka
  OVS ML2 plugin with DVR
  Ceph Backend Storage

  Thanks

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