Comment 1 for bug 1710477

For a converged architecture where nova-compute resides on the same host as ceph-osd there is another potential problem: if nova-compute is upgraded before ceph-osd, ceph packages will get upgraded as well due to `apt upgrade` before ceph-mons are upgraded on other units (although an osd process might still be running with an old version unless explicitly restarted).

The same applies to charm-neutron-gateway and charm-ceph-osd if they are collocated on the same logical host.

Even though this is not directly related to the ceph-osd charm it is an important side-effect to remember about.