Description of problem:

https://access.redhat.com/documentation/en/red-hat-ceph-storage/2/single/installation-guide-for-red-hat-enterprise-linux#configuring_ceph_osd_settings

Adding warning message at the end of this chapter would be helpful.

Some osd options are conflicting each other. As in /usr/share/ceph-ansible/roles/ceph-common/tasks/checks/check_mandatory_vars.yml

~~~
name: verify only one osd scenario was chosen
  fail:
    msg: "please select only one osd scenario"
  when:
    osd_group_name is defined and
    osd_group_name in group_names and
    ((journal_collocation and raw_multi_journal) or
    (journal_collocation and osd_directory) or
    (raw_multi_journal and osd_directory) or
    (bluestore and journal_collocation) or
    (bluestore and raw_multi_journal) or
    (bluestore and osd_directory))
~~~

bluestore is tech preview so we don't need to worry about here.

(journal_collocation and raw_multi_journal) or
(journal_collocation and osd_directory) or
(raw_multi_journal and osd_directory) or

These are 3 scenario we need to avoid when enabling osd options


Version-Release number of selected component (if applicable):


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