Hi,

On 28 Dec 2010, at 20:32, Michael Schwartzkopff wrote:
> Hi,
> 
> I have four nodes in a split site scenario located in two computing centers. 
> STONITH is enabled.
> 
> Is there and best practise how to deal with this setup? Does it make sense to 
> set expected-quorum-votes to "3" to make the whole setup still running with 
> one data center online? Is this possible at all?
> 
> Is quorum needed with STONITH enabled?
> 
> Is there a quorum server available already?

I couldn't see a quorum server in Pacemaker so I have installed a third dummy 
node which is not allowed to run any resources (using location constraints and 
setting the cluster to not be symmetric) which just acts as a third vote.  I am 
hoping this effectively acts as a quorum server as a node that looses 
connectivity will lose quorum and shut down its services whilst the other real 
node will retain connectivity and thus quorum due to the dummy node still being 
present.

Obviously this is quite wasteful of servers as you can only run a single 
Pacemaker instance on a server (as far as I know) so that is a lot of dummy 
servers when you run multiple pacemaker clusters...  Solution for us is to use 
virtualization - one physical server with VMs and each VM is a dummy node for a 
cluster...

Best regards,

        Anton

> 
> Thanks for any hints,
> 
> Greetings!
> 
> -- 
> Dr. Michael Schwartzkopff
> Guardinistr. 63
> 81375 München
> 
> Tel: (0163) 172 50 98
> _______________________________________________
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> Bugs: 
> http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker

Best regards,

        Anton
-- 
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer, http://www.linux-ntfs.org/


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