[Linux-cluster] Replacing network switch in a cluster

Martijn Storck martijn.storck at gmail.com
Wed Jun 22 09:11:56 UTC 2011

Well, after reading man openais.conf the settings below seemed ok for this
operation, so I just went ahead with it. I connected the old and new switch
and moved the cluster nodes over one by one (which meant the link was down
for 4-5 seconds). There were no problems whatsoever.


On Fri, Jun 17, 2011 at 9:26 AM, Martijn Storck <martijn.storck at gmail.com>wrote:

> Hi all,
> Unfortunately I have to swap out the switch that is used for the cluster
> traffic of our 4-node cluster for a new one. I'm hoping I can do this by
> connecting the new switch to the old switch and then moving the nodes over
> one by one.
> Can I change the cluster configuration so that there is a longer grace
> period before a node is deemed 'lost' and gets fenced? The only line in my
> cluster.conf that looks like it has anything to do with it is this one:
>         <totem consensus="4800" join="60" token="10000"
> token_retransmits_before_loss_const="20"/>
> I think that with faststart enabled the link with a node will be down for
> only a few seconds. I realize that this probably means the cluster will lock
> up during that period (since we use a lot of GFS), but it's still better
> than having to bring the entire cluster down.
> Kind regards,
> Martijn Storck
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