[Pacemaker] stonith - using multiple fencing devices for one node to fence device with redundant power sources

[David Vossel]

----- Original Message -----
> From: "Nikola Ciprich" <nikola.ciprich at linuxbox.cz>
> To: pacemaker at oss.clusterlabs.org
> Sent: Thursday, October 3, 2013 7:42:39 AM
> Subject: [Pacemaker] stonith - using multiple fencing devices for one node to fence device with redundant power
> sources
> 
> Hello,
> 
> I'm playing with netio 230-CS PDU, and it works pretty well as
> fencing device for my testing pacemaker cluster. However, I'd like
> to use two such units plugged to different power sources and
> use them as fencing units for servers with redundant power supplies
> (each connected to one of the PDUs).
> 
> Is there some way to tell, node needs to be fenced using two fencing
> devices? Or I'll need to create my own fencing plugin allowing to
> use two fencing devices simultaneously?

Not simultaneously (not sure if that is actually a requirement), but in serial this is possible.

Take a look at fencing levels.
http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemaker_Explained/index.html#_advanced_fencing_configurations

You'd want to set both of these devices at the same fencing level for whatever nodes they can fence. This will require stonith to use both devices before considering the node fenced.

Hope that helps,
-- Vossel


> 
> any help would be greatly appreciated
> 
> thanks a lot in advance
> 
> nik
> 
> 
> 
> 
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