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Re: [Linux-cluster] Replacing network switch in a cluster

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 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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