[Linux-cluster] Multiple links to a cluster

Flavio Junior billpp at gmail.com
Fri Dec 12 01:40:36 UTC 2008

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Use channel bonding...


- --

Flávio do Carmo Júnior aka waKKu

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On Thu, Dec 11, 2008 at 11:32 PM, Michael O'Sullivan <
michael.osullivan at auckland.ac.nz> wrote:

> Hi everyone,
> I have been trying to set up a 2-node cluster where both nodes have
> multiple links to the cluster. Initially, I specified two IP addresses for
> each cluster node in /etc/hosts, but this seemed to confuse the fencing and
> make the cluster hang.
> Now I am trying to use a link equalizer (TEQL device, see the Linux
> Advanced Routing and Traffic Control - lartc.org for details) which uses a
> single IP address and shares the load across the two links. However, some
> packets may be delivered out of order...
> Unfortunately, using the TEQL device makes the 2-node cluster have a
> split-brain problem that I can't seem to remedy. I changed /etc/hosts to use
> one of the actual NICs instead of the TEQL device and got the cluster going,
> but as soon as I go back to the TEQL device node 1 thinks node 2 is offline
> and node 2 thinks node 1 is offline...
> Does anyone have any suggestions to fix this? Or alternatives for using a
> single IP address? (Note, I have not used ethernet bonding as it does not
> utilize the full capacity of both links whereas I think TEQL will.)
> I'm happy to supply any extra information required. Thanks in advance for
> any help, Mike
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