Question regarding bonding of multiple eth's
I finally figured it out and thought I
would share in case someone else stumbles upon this problem.
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After doing a lot of research I found
that I had to add the following line to my /etc/modules:
bonding mode=1 miimon=100 downdelay=200
updelay=200
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It seems to be working perfectly now.
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Chris Stackpole
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From: Stackpole, Chris
[mailto:CStackpole@barbnet.com]
Sent: Thursday, October 30, 2008
1:01 PM
To: debian-user@lists.debian.org
Subject: Question regarding
bonding of multiple eth's
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I seem to be having a problem with bonding under Debian
Lenny, but I am not sure exactly what the problem is.
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I have two servers and each server has two gigabit network
cards. We have two gigabit switches that we use so that we have failover should
one die. I matched both eth0’s to switch0 and both eth1’s to switch
one. I then bonded the eth’s together on both servers. I posted how I did
it below just in case I screwed something up. Once I did the bonding,
everything looks to be OK. I can ping out and I can ping the hosts from other
systems. I pulled the network plug from one of the cards and watched that the
failover worked as it should. Then I plugged it back in and removed the other.
Everything worked as I thought it should; I am not an expert at bonding but I
have used the same method a few times now without problem.
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Well I went on about my business and soon complaints began
to come in that one server was much slower then the other. :-/
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I began investigating and sure enough, one system is slower.
Transferring a 1GB file across the network, I easily maintain ~38-40M/s on the
first host and I usually top out around 15-18MB/s on the other. Ifconfig shows
that both cards are set to the proper speed (txqueuelen:1000) but it
isn’t behaving like should be. Worse is when I do a watch or htop or
something else that updates I can notice the lag. For example, I have
ssh’d into the system and have htop running right now; it is supposed to
update every 2 seconds. It works like it should for a short time but then every
once in a while the screen freezes for about 10 seconds, then everything
updates all at once and continues its 2 second update interval.
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I thought it was the network cards, so I disabled the
bonding and tested each of them. I get gigabit speeds individually. Rebonded
the cards and I am back to the slow speeds. I turned off the system to see if
there was physical damage or something (found nothing) and when I brought it
back up I saw this in the logs:
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Oct 30 11:53:04 Hostname kernel: [Â*Â* 10.167568]
bonding: bond0: Warning: failed to get speed and duplex from eth0, assumed to
be 100Mb/sec and Full.
Oct 30 11:53:04 Hostname kernel: [Â*Â* 10.167568]
bonding: bond0: enslaving eth0 as an active interface with an up link.
Oct 30 11:53:04 Hostname kernel: [Â*Â* 10.264691]
bonding: bond0: Warning: failed to get speed and duplex from eth1, assumed to
be 100Mb/sec and Full.
Oct 30 11:53:04 Hostname kernel: [Â*Â* 10.264691]
bonding: bond0: enslaving eth1 as an active interface with an up link.
Oct 30 11:53:04 Hostname kernel: [Â*Â* 10.578052]
NET: Registered protocol family 10
Oct 30 11:53:04 Hostname kernel: [Â*Â* 10.579606]
lo: Disabled Privacy Extensions
Oct 30 11:53:05 Hostname kernel: [Â*Â* 12.884391]
tg3: eth0: Link is up at 1000 Mbps, full duplex.
Oct 30 11:53:05 Hostname kernel: [Â*Â* 12.884391]
tg3: eth0: Flow control is off for TX and off for RX.
Oct 30 11:53:06 Hostname kernel: [Â*Â* 13.012292]
tg3: eth1: Link is up at 1000 Mbps, full duplex.
Oct 30 11:53:06 Hostname kernel: [Â*Â* 13.012292]
tg3: eth1: Flow control is off for TX and off for RX.
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I see the tg3 messages in the first server, but I
don’t see the bonding warnings. My guess is that the bonding is somehow
screwed up and stuck on 100Mb/sec and doesn’t update when the cards go to
1000Mb/sec. I tried to find an answer via google but did not find anything that
seemed useful to me. I see others have had this problem, but I found no
solution that helped me.
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Â*I don’t know why one works and the other
doesn’t. They should be pretty similar in setup and configuration as I
didn’t do anything drastically different when I built them.
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Any help would be appreciated.
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Thanks!
Chris Stackpole
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How I did the bonding:
# apt-get install ifenslave
# vi /etc/network/interfaces
auto lo
iface lo inet loopback
auto bond0
iface bond0 inet static
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address 10.3.45.3
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netmask 255.255.255.0
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network 10.3.45.0
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broadcast 10.3.45.255
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gateway 10.3.45.251
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dns-nameservers 10.1.1.5 10.1.1.6
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dns-search mydomain.com
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up /sbin/ifenslave bond0 eth0 eth1
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down /sbin/ifenslave -d bond0 eth0 eth1
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Then I restarted (yeah I know I could have just reset the
network but I restarted).
When it was back up ifconfig shows bond0, eth0, eth1, and lo
all correctly.
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