When upgrading to 4.x existing ceph-disk based OSD containers will need to be migrated to ceph-volume based OSD containers.
It was observed that ceph-disk OSDs were migrated to ceph-volume OSDs successfully during rolling update. (We have hit BZ 1792122 after rebotting a bluestore node after migration.) Moving this BZ to verified state.
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-2020:0313