You can upgrade your existing Ceph cluster from Jewel to Luminous and from Luminous to Nautilus and roll back Ceph VMs and OSDs if the upgrade fails.
Warning
The upgrade of Ceph Luminous to Nautilus is supported starting from the 2019.2.10 maintenance update. If your Ceph version is Jewel, first upgrade to Ceph Luminous as described below.
See also