In order to improve scaling and reduce the load to OVSDB SB servers, Neutron could connect to OVSDB replication SB servers in read-only mode.

So far, the main use case of writing to SB database is the agent liveness checks where Metadata agents write to the Chassis Private table to reflect that they are alive. Theoretically, this can be avoided by writing into local OVSDB and let ovn-controller copy it over to the SB database.

The purpose of this BZ is to research if we can stop writing (or at least reduce the number of 'writing' connections) to SB database and distribute the reading load across the Active/Passive cluster.

Thanks to Ilya Maximets & Dumitru Ceara for the ideas.