[ceph-users] Upgrade Luminous to Nautilus on a Debian system

Hi all, I'm planning to upgrade one on my Ceph Cluster currently on Luminous 12.2.13 / Debian Stretch (updated). On this cluster, Luminous is packaged from the official Ceph repo (deb https://download.ceph.com/debian-luminous/ stretch main) I would like to upgrade it with Debian Buster and Nautilus using the croit.io repository (deb https://mirror.croit.io/debian-nautilus/ buster main) I already prepared the steps procedure but I just want to verify one step regarding the upgrade of the ceph packages. Do I have to upgrade ceph in the same time than Debian or do i have to upgrade ceph after the Debian upgrade from Stretch to Buster ? 1) In the first case : * Replace stretch by buster in /etc/apt/sources.list * Modify the ceph.list repo by croit.io one * Upgrade the entire nodes 2) In the second case (upgrade Debian then Ceph) * Replace stretch by buster in /etc/apt/sources.list * keep the /etc/apt/sources.list.d/ceph.list as it is * Upgrade and reboot the nodes * replace the ceph.list file by croit.io * upgrade the ceph packages * restarting the Ceph services (in the right order MON -> MGR -> OSD -> MDS) Thanks a lot for your advices Regards, Hervé