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 <[email protected]> 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 > > > -- > Linux-cluster mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/linux-cluster >
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