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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