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?
Marcelo
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