[ceph-users] Issues with RBD when rebooting

[Josef Zelenka]

Hi, we are running a jewel cluster (54OSDs, six nodes, ubuntu 16.04) 
that serves as a backend for openstack(newton) VMs. TOday we had to 
reboot one of the nodes(replicated pool, x2) and some of our VMs oopsed 
with issues with their FS(mainly database VMs, postgresql) - is there a 
reason for this to happen? if data is replicated, the VMs shouldn't even 
notice we rebooted one of the nodes, right? Maybe i just don't 
understand how this works correctly, but i hope someone around here can 
either tell me why this is happenning or how to fix it.

Thanks
Josef

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