On 01/28/2015 11:28 PM, Patrick Bervoets wrote: > > Arping on the troublesome server gives 0 responses. > > I just tried with a physical console on that server and there I got the > same unresponsive behaviour. Well, that's a different story, then. :) I haven't seen delays anywhere near that long before, even with heavy swapping. But I guess I'd look at that sort of thing first. Run "iostat -x 2" and see if your disks are being fully utilized during the pauses. Run "top" and see if there's anything useful there. Check swap use with "free". Try decreasing swappiness with "echo 10 >/proc/sys/vm/swappiness"