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Ovens, freezers, and radiofrequency cavities: The ongoing migration of the CERN Cloud to OVN#

Open vSwitch and OVN 2026 Fall Conference digest Program Adjacent pick 2–4 November 2026

Abstract

Christopher Barnes, CERN; Richard Bachmann, CERN

  • Why: A 1.4k-hypervisor, 15k-VM private OpenStack cloud migrating LinuxBridge → OVN across two datacenters is a serious private-cloud migration at research-lab scale — squarely the PM's virtualization/private-cloud territory, told with open questions rather than a victory lap.
  • What: Mid-migration experience report: deployment adjustments made along the way, issues encountered, and open questions the CERN team wants community input on. (from abstract only)
  • How: Incremental migration of a two-datacenter OpenStack cloud from LinuxBridge networking to OVN.
  • Where applicable: OpenStack-based private clouds; CERN's scale and two-site layout are specific, but the LinuxBridge→OVN migration playbook is broadly reusable.