Hi,

> When rebooting one of the nodes (e. g. for a kernel upgrade) the OSDs
> do not seem to shut down correctly. Clients hang and ceph osd tree show
> the OSDs of that node still up. Repeated runs of ceph osd tree show
> them going down after a while. For instance, here OSD.7 is still up,
> even though the machine is in the middle of the reboot cycle.

...

> Any ideas as to what is causing this or how to diagnose this?

I see this behavior (only) when I reboot a ceph-node with a monitor and OSDs.
I guess somehow this relates. (OSD-messages getting lost due to the „failing“ 
mon)

greetings

Johannes
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