Hi Nash, I'm interested in your case, but I need some information below to understand your case. We can set up collaboration if needed to solve this. I'm using OVN mostly for OpenStack.
1. May I know your physical and logical topology? 2. What have you seen with packet capture regarding your heartbeat loss case? 3. Does this case happen from the beginning of the VM connected by OVN? 4. How do you configure your OVN logical networks on NB? Best regards, Date: Mon, 15 Jul 2024 10:16:17 +0100 > From: Nash Oudha <nash.ou...@oracle.com> > To: b...@openvswitch.org > Subject: [ovs-discuss] Impact of OVN Network Connectivity on Virtual > Machine Heartbeat in OVN with External Deployment > Message-ID: <fcd409d5-78e9-4328-b488-15018d672...@oracle.com> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > Dear OpenVSwitch Team, > > We're reaching out to inquire about the behavior of OVN networks in a > specific deployment scenario. > > *Our Setup:* > > * We have Open Virtual Network (OVN) deployed within an Ovirt > environment. > * The OVN northbound (NB) database,southbound (SB) database,and other > daemons reside on the Ovirt manager/engine,which is located outside > the KVM hypervisors.This means they are not running on the same > physical machines as the KVM hypervisors. > > *The Issue:* > > * We have virtual machines configured to use OVN networks for their > cluster network heartbeat. > * In a recent incident,the network connection between the Ovirt > manager and the KVM hypervisors was lost.It's important to note that > the Ovirt engine itself was not connected to the heartbeat OVN > network.Only the management connection between the engine and the > KVM hypervisors was affected.While the KVM hypervisors should have > remained able to communicate with each other,we observed the > following behavior: > o As soon as the engine network connection to the KVM host was > disconnected,virtual machines using the OVN network began to > panic and reboot. > o Other VMS that does not use OVN network has no issue whatsoever. > > *Our Question:* > > * In this scenario,where OVN is deployed externally to the > hypervisors,does restarting the VM/host that houses the Ovirt engine > and OVN lead to a loss of connection for all OVN networks on the > hypervisors? > > *Additional Context:* > > * We'd appreciate any insights or recommendations you may have to > mitigate this behavior and ensure the stability of our OVN network > in such situations. > > Thank you for your time and assistance. > > > Thanks > > Nash Oudha > > Oracle Virtualization Team > >
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