Upgrading the OSD nodes is a similar process to upgrading the monitor nodes and should be done one OSD at a time. At a high level, the upgrade process includes enabling the Jewel repositories, updating the ownership of the OSD directories, and restarting the OSD. Let's review the following steps for a detailed upgrade procedure for the Ceph OSDs:
- While upgrading the OSD nodes, some placement groups will enter a degraded state because one of the OSDs backing the PGs might be down or restarting. We will set two flags on the cluster prior to upgrading the OSD nodes, which will prevent the cluster from marking an OSD as out and triggering recovery. We will be upgrading a single OSD node at a time and moving to the ...
