Am 28.03.16 um 16:23 schrieb Marcelo Ricardo Leitner: > Em 28-03-2016 06:27, Götz Reinicke escreveu: >> Hi, >> >> may be someone has an idea: >> >> We have three supermicron servers with two 10Gb Ports each, connected >> to a cisco switch stack 1Gb ports. All are on auto speed. >> >> I configured a LACP bond on both sides on all servers, first with >> citrix xen server. >> >> On one server eth0 goes down from time to time … maybe within minutes, >> someday it is up for some hours. >> >> Two server are fine; the bond is up for 24 days(!) now without any >> problem. >> >> Recently I installed centos 7.2 on that server in question and - bam - >> eth0 is going down from time to time … >> >> I checked patch cables, tried an other switch port channel, >> reconfigured the ports, reinstalled the os. Same behavior. >> >> And: We got a replacement server. Same behavior …. :) >> >> Currently the cisco tech guys don’t see a problem on the switch (which >> is up for 3 Years now with 10+ servers connected … no problem so far), >> from the citrix side I don’t get much more hints. >> >> In the logs i just have a Nic Link is Down … Nic Link is Up. It is >> always eth0. >> >> Question: >> >> Any idea ? One suggestion was Disable all power saving features in the >> server bios. Did not do that yet. >> >> Is there any chance to set some sort of higher debug level for that >> nic/kernel/whatever to get some server os side feedback why the port >> goes down? >> >> Regards and thanks for any hint! . Götz > > If you are seeing NIC Link is Down as in: > [710442.668059] e1000e: enp0s25 NIC Link is Down > then the NIC lost its link and bond is just protecting you as you > probably didn't have any downtime due to that. IOW bonding is not the > issue. > > Which NIC do you have on those servers? The mainbord is a supermicro X10DRI-T with Intel X540 Dual port 10GBase-T. regards . Götz