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In chapter "3.7. Backwards compatibility with older versions of Red Hat Ceph storage" of the document "Red Hat Ceph Storage for The Overcloud" (https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/10/html-single/red_hat_ceph_storage_for_the_overcloud/#backwards_compatibility_with_older_versions_of_red_hat_ceph_storage) our documentation describes the following environment file: parameter_defaults: ExtraConfig: ceph::conf::args: client/rbd_default_features: value: "1" While the upstream document (https://docs.openstack.org/tripleo-docs/latest/install/advanced_deployment/ceph_external.html) says: Last but not least, from the Newton release TripleO will install Ceph Jewel. If the external Ceph cluster uses the Hammer release instead, you should also pass the following parameters to enable backward compatibility features: parameter_defaults: ExtraConfig: ceph::profile::params::rbd_default_features: '1' Based on the input received from a customer the upstream documentation is correct.
Assigning to Laura for review. Laura, this looks like a relatively simple fix that applies to the RHOSP 10 book (the osp10-newton branch). I'd recommend confirming the suggested fix with somebody from the Ceph DFG before applying it.
The OSP10 documentation is correct and has already been vetted. See: https://bugzilla.redhat.com/show_bug.cgi?id=1385034 Both syntaxes are valid, however the upstream one relies on the following puppet-ceph patch having landed which may not be the case for all OSP10 users. Thus, it's safer to leave the OSP10 documentation as is. https://review.openstack.org/#/c/283359/