[Linux-cluster] Two node question

[Lon Hohberger]

On Mon, 2007-10-29 at 09:48 -0700, Scott Becker wrote:
> I'm building a 3-node cluster.
> 
> One public subnet.
> 
> No shared filesystem
> 
> Starting with just one service (www) on one movable IP address.

So, static content copied manually (or rsync'd periodically) between
multiple nodes...


> I will be routinely bring down one node at a time for maintenance so I 
> must configure the cluster for one node operation. I can't use the 
> two_node="1" setting because I would have to bring the cluster down to 
> set and unset it.

Not only that, but you need to use power fencing w/ two_node="1" for it
to work.


> I want to use an IP tie-breaker to verify that the node can reach the 
> main router. Is this, along with a self test of the web service, fs 
> writable, etc. adequate for one, two and three node operation? Or would 
> I also need a Qdisk?

Currently, you can't use qdisk to do that - because qdisk needs to talk
to shared storage (and therefore, fencing) as well.


What about just getting another pair of nodes that you can just let run
and running piranha+LVS to direct traffic to your frequently-maintained
servers since there's no shared data?

It kind of side-steps the quorum problem.

-- Lon