Hi, I investigated an other problem with my nautilus 14.2.11 (with 14.2.10 as well) cluster. If I stop the OSDs on one node (systemctl stop ceph-osd.target, or shutdown/reboot) it took mostly several seconds until the cluster detects the OSDs as down and I run in slow requests. I identified the option "osd_fast_shutdown". If I configure it to "false" I see in the ceph.log immediately on shutdown the logs like this: cluster [INF] osd.837 marked itself down If the parameter is true (default setting) The cluster needs some time until I get hundert of lines like this in the ceph.log cluster [DBG] osd.317 reported immediately failed by osd.202 until all detection and peering is done I got slow requests. On smaller clusters, with only 48 OSDs on 4 Nodes the down detection works a lot of faster. But on the big one I need to set this to false to work like expected. I wonder if someone else see this. I think it is OK to short the shutdown process, but it would be nice, if the OSDs tell the mon its shutdown itself Manuel