[Linux-HA] About Stonith resources

[Dejan Muhamedagic]

Hi,

On Fri, Jun 19, 2009 at 09:08:27AM +0200, Michael Schwartzkopff wrote:
> Am Freitag, 19. Juni 2009 08:56:12 schrieb Alain.Moulle:
> > Hi
> > I'm quite new on Heartbeat-v2 , I have some questions about stonith
> > resources :
> 
> Read: http://www.clusterlabs.org/mediawiki/images/f/f2/Crm_fencing.pdf
> 
> > I have heartbeat-v2 on a cluster of 4 nodes and I use external/ipmi type
> > for stonith resource.
> >
> > 1. I read somewhere that it is judicious to configure the stonith
> > resource as clone , but I wonder
> > how to set a different IPMI IP address for each clone on each node ? so
> > it seems not possible for me ...
> 
> It make no sense to clone IPMI since it is host specific. You can clone 
> resources that fence more than one host.

Actually, it's a bit different: clones make sense in case the
stonith resource is accessible from all nodes. They do make more
sense if they can fence more than one host :) Though, one can
also run just one copy and that copy should take care of the
stonith operation. Making clones should supposedly make it
more probable that the fencing operation is going to succeed,
though if you monitor stonith resource, one should suffice. Also,
some devices get confused if they receive more than one request
in parallel.

> > 2. If I can't use "clone" for stonith resource (because of point 1.) ,
> > do I have to set 3 stonith resources
> > on each node with the 3 IPMI IP address of the other nodes ? or (and I'm
> > about to think so) can I
> > set only one stonith resource on each node which will have to stonith
> > only one other node in the cluster.
> > In other terms : one node in the 4 nodes cluster has the responsability
> > to stonith only one another node,
> > and each node has another node which has the responsability to stonith
> > it in case of problem.
> 
> Make one stonith resource for each host and use constraints to be sure that 
> the according resource is NOT running the the node it fences.

Thanks,

Dejan

> 
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