The upstream DCN documentation [1] has this example NovaAZAttach: false However, the NovaAZAttach does not exist in THT as per a search [2] and empirical testing shows that the parameter is not overriden in the nova.conf of a deployed overcloud. The workaround is to use something like this: ExtraConfig: nova::cross_az_attach: false The above works because we have the required puppet [3]. We should probably make NovaAZAttach real or create something like NovaCrossAzAttach. [1] https://docs.openstack.org/project-deploy-guide/tripleo-docs/latest/features/distributed_compute_node.html [2] https://github.com/openstack/tripleo-heat-templates/search?q=NovaAZAttach [3] https://github.com/openstack/puppet-nova/commit/958c5b2f35e0789b0e280ba1f7662ebe19e4bad6
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:3148