Am 28.03.2016 um 11:27 schrieb Götz Reinicke <goetz.reinicke@xxxxxxxxxxxxxxx>:
> 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?
How is your interface exactly configured ?
--
LF
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