Hello, The last 3 days I worked at a customer with a 1800 OSD cluster which had to be upgraded from Hammer 0.94.5 to Jewel 10.2.2
The cluster in this case is 99% RGW, but also some RBD. I wanted to share some of the things we encountered during this upgrade. All 180 nodes are running CentOS 7.1 on a IPv6-only network. ** Hammer Upgrade ** At first we upgraded from 0.94.5 to 0.94.7, this went well except for the fact that the monitors got spammed with these kind of messages: "Failed to encode map eXXX with expected crc" Some searching on the list brought me to: ceph tell osd.* injectargs -- --clog_to_monitors=false This reduced the load on the 5 monitors and made recovery succeed smoothly. ** Monitors to Jewel ** The next step was to upgrade the monitors from Hammer to Jewel. Using Salt we upgraded the packages and afterwards it was simple: killall ceph-mon chown -R ceph:ceph /var/lib/ceph chown -R ceph:ceph /var/log/ceph Now, a systemd quirck. 'systemctl start ceph.target' does not work, I had to manually enabled the monitor and start it: systemctl enable ceph-mon@srv-zmb04-05.service systemctl start ceph-mon@srv-zmb04-05.service Afterwards the monitors were running just fine. ** OSDs to Jewel ** To upgrade the OSDs to Jewel we initially used Salt to update the packages on all systems to 10.2.2, we then used a Shell script which we ran on one node at a time. The failure domain here is 'rack', so we executed this in one rack, then the next one, etc, etc. Script can be found on Github: https://gist.github.com/wido/06eac901bd42f01ca2f4f1a1d76c49a6 Be aware that the chown can take a long, long, very long time! We ran into the issue that some OSDs crashed after start. But after trying again they would start. "void FileStore::init_temp_collections()" I reported this in the tracker as I'm not sure what is happening here: http://tracker.ceph.com/issues/16672 ** New OSDs with Jewel ** We also had some new nodes which we wanted to add to the Jewel cluster. Using Salt and ceph-disk we ran into a partprobe issue in combination with ceph-disk. There was already a Pull Request for the fix, but that was not included in Jewel 10.2.2. We manually applied the PR and it fixed our issues: https://github.com/ceph/ceph/pull/9330 Hope this helps other people with their upgrades to Jewel! Wido _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
