What is your kernel version ? On kernel >= 3.11 sysctl -w "net.ipv4.tcp_window_scaling=0" seems to improve the situation a lot. It also helped a lot to mitigate processes going (and sticking) in 'D' state. Le 24/07/2014 22:08, Udo Lembke a ?crit : > Hi again, > forget to say - I'm still on 0.72.2! > > Udo > > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Jean-Tiare, shared-hosting team