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List:       linux-ha-dev
Subject:    Re: AW: [Linux-ha-dev] Proposal: Heartbeat ping membership
From:       Alan Robertson <alanr () suse ! com>
Date:       2000-08-15 13:11:48
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Martin Bene wrote:
> 
> Hi,
> 
> > I agree. I also belive that having the ability to achive a psudo-quorum
> > within the existing heartbeat infastructure would be very useful indeed.
> > The only down side I see is that switch IP addresses aren't always
> > resources that are used very often so essentially this may add extra
> > configuration/ maintinence requirements to the network. This is of course
> > only if you wish to use the new feature.
> 
> "Mee too" :-) Seriously - having some sort of quorum code to make a decision
> to give up resources if "the rest of the world" goes away would be quite
> useful.
> 
> I see a bit of a problem from the combination of ping-pseudo members and a
> secondary heartbeat network: a two nodes + one ping device cluster, a loss
> of network connectivity in one of the nodes would not result in that node
> giving up any resources as it can still see the 2nd node on the secondary
> heartbeat medium.

That's a different problem.

All heartbeat does now is measure if the *node* goes away.  It does NOT do
resource monitoring, where an ethernet is an example of a kind of resource.

Luis Claudio R. Goncalves of Conectiva is looking at a cluster manager based on
the heartbeat API, and that is one of the kind of things he's looking at.

	-- Alan Robertson
	   alanr@suse.com

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