On 1/22/2013 7:39 PM, David Lang wrote:

> I've also had network connectivity restored (switch got rebooted,
> someone noticed a loose cable and plugged it in, etc)
>
> What I would do would be to look into defining a ping node that could be
> used as the tie-breaker (but that ping node needs to be HA as well)

I mentioned nagios: have external host monitor the cluster and 
individual nodes.

> The real question that you need to answer before going down this road is
> how much damage you suffer in a split-brain situation.

Yep. If you have a read-only service you can get around that by having 
two copies of the data (each node has its own copy). If it's read-write 
you need to add drbd to the mix and start worrying about split-brain, 
stonith, and tie breakers.

Dima


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