I'm not sure what to say about how Pacemaker *should* behave, but I *can* say I 
virtually never try to (cleanly) reboot a host from which I have not already 
evacuated all resources, e.g. with `pcs node standby` or by putting Pacemaker 
in maintenance mode and unmounting/exporting everything manually.  If I can't 
evacuate all resources and complete a lustre_rmmod, the host is getting 
power-cycled.

So maybe I can say, my guess would be that in the host's shutdown process, 
stopping the Pacemaker service happens before filesystems are unmounted, and 
that Pacemaker doesn't want to make an assumption whether its own shut-down 
means it should standby or initiate maintenance mode, and therefore the other 
host ends up knowing only that its partner has disappeared, while the 
filesystems have yet to be unmounted.

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