We need to document how OSP13 users can use the new validations introduced in bz1760567 and bz1777336. Please write a new "book" describing how to use the pre-deployment ceph validations (sample copy to follow) and add it to the following docs. 1. It could be a new chapter of things you do after you've deployed your undercloud but before you deploy your overcloud https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/deploying_an_overcloud_with_containerized_red_hat_ceph/index 2. It could be a prereq for external ceph since external ceph requires the right ceph-ansible too. https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/integrating_an_overcloud_with_an_existing_red_hat_ceph_cluster/index 3. It could be a new assumption added to HCI doc: https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/hyper-converged_infrastructure_guide/introduction#intro-assumptions
The undercloud contains ansible-based validations which should be run before deploying the overcloud to identify potential problems. These validations can help you avoid debugging overcloud deployment failures by looking for common problems before they happen. To ensure that the correction version of ceph-ansible is installed run the following: ansible-playbook -i /usr/bin/tripleo-ansible-inventory /usr/share/openstack-tripleo-validations/validations/ceph-ansible-installed.yaml