Dear all In the mid of January I updated my ceph cluster from Luminous to Nautilus. Attached you can see the memory metrics collected on one OSD node (I see the very same behavior on all OSD hosts) graphed via Ganglia This is Centos 7 node, with 64 GB of RAM, hosting 10 OSDs. So before the update there were about 20 GB of FreeMem. Now FreeMem is basically 0, but I see 20 GB of Buffers, I guess this triggered some swapping, probably because I forgot to set vm.swappiness to 0 (it was set to 60, the default value). I was wondering if this the expected behavior PS: Actually besides updating ceph, I also updated all the other packages (yum update), so I am not sure that this different memory usage is because of the ceph update For the record in this update the kernel was updated from 3.10.0-1062.1.2 to 3.10.0-1062.9.1 Thanks, Massimo