[Pacemaker] Question: 2 node cluster in two datacenters - how to avoid split brain

[Senftleben, Stefan (itsc)]

Thanks,
what is your opinion to this:
I configure a third node and let the quorum votes decide which node is active?

Regards
Stefan

-----Ursprüngliche Nachricht-----
Von: Michael Schwartzkopff [mailto:misch at schwartzkopff.org] 
Gesendet: Donnerstag, 10. November 2011 10:37
An: The Pacemaker cluster resource manager
Betreff: Re: [Pacemaker] Question: 2 node cluster in two datacenters - how to avoid split brain

> Hello,
> 
> first of all I want to say hello all recipients of the pacemaker
> mailinglist!
> 
> I manage a two node active-passive cluster with an ms-drbd-resource and a
> depending resource. Each node is located in a separate datacenter,
> connected by a single dwdm-connection, a second network connection is not
> available. In case of a network interuption between the datacenters a
> split brain situation is created and a manual intervention of the admin is
> needed.
> 
> What are your recommendations for me to avoid the split brain situation?
> 
> 
> 
> Thanks in advance!
> 
> Best regards,
> 
> Stefan

Set up fencing using an independent communication channel, other than your 
primary dwdm connection.

Most simple solution: meatware plugin, but this also requires administrator 
intervention. Other solutions, like dial-in services are also possible.

Greetings,

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
Fax: (089) 620 304 13