After deploying Ceph with ceph-deploy on Bionic, the latest luminous (12.2.12) has ceph-disk creating a file for a journal - something that is very surprising as I have never seen that functionality in ceph-disk, without specifying any flags that might indicate a file is needed. Using the same approach with ceph-ansible, the OSD would be created with a partition (again, via ceph-disk). Same arguments and all, similar to: ceph-disk -v prepare --cluster=ceph --filestore --dmcrypt /dev/sdX After going through all the ceph-disk output, this line got different results from the ceph-deploy cluster than the ceph-ansible one: /usr/bin/ceph-osd --check-allows-journal -i 0 --log-file /var/log/ceph/$cluster-osd-check.log --cluster ceph --setuser ceph --setgroup ceph The ceph-deploy cluster returns a 'no' the ceph-ansible one returns a 'yes'. The documentation doesn't seem to explain where or how to set/unset this. The references to the flag itself are minimal, just mentioning that the '--allows-journal' flag is to check if a journal is allowed or not. How does one tell a cluster that a journal is allowed (or not)? I am happy to go and expand on the documentation to explain this a bit even if it is for Luminous only since ceph-volume doesn't check this.
