[Linux-cluster] question about 2 nodes cluster

[Ian Hayes]

You don't need a third node or quorum disk... A 2-node cluster is sort of a
special case, which is why there is a special config line for a setup with
only 2 nodes. I'm running a couple of 2-node clusters right now with no
quorum disk. The main issue I've encountered is that they can go split-brain
easily, and you get to watch both nodes fence each other off endlessly.
Adding clean_start="1" to the fence_daemon line helps prevent this, but a
quorum disk would be better if you're absolutely committed to a 2-node
setup.

I'm running a test cluster at this moment with 3 nodes and a 1Gb quorum
partition that is shared out via iSCSI. I sort of discovered that I needed a
quorum disk the hard way after taking 2 nodes down and the suriviving node
gave up due to the cluster being inquorate.


On Mon, Jun 8, 2009 at 5:22 AM, ESGLinux <esggrupos at gmail.com> wrote:

> Hi all,
> I have one  existential question about two nodes cluster. I have read that
> for 2 nodes cluster is necessary a third element to give stabilty to the
> cluster.
>
> One way is to add a third node, so its not a 2 nodes cluster. For me its
> not an answer because It becomes another kind of cluster ( 3 nodes cluster)
>
> Other, is to use qdisk (this is the way I´m trying nowadays)
>
> My question is if it´s absollutely necesary this third element in the
> architecture. and If so which are the options, ?
>
> thanks in advance
>
> ESG
>
>
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