Hi,

On Thu, Aug 20, 2009 at 03:58:19PM +0200, Andrew Beekhof wrote:
> On Thu, Aug 20, 2009 at 3:56 PM, Terry L.
> Inzauro<[email protected]> wrote:
> 
> > Ok. I am indeed using 'external/ssh' as the stonith device.   I figure it 
> > was better than nothing as I do not have access to
> > a hardware stonith device.  In you opinion, is using the 'external/ssh'  
> > plugin 'better' than NOT using a stonith plugin at all?
> 
> personally, i think so.
> but there are plenty that disagree.

Ah, that would include me :)

If the stonith device fails to fence the failing node then there
is no failover and you get zero availability. The probability
that that happens is much higher when using a device such as
external/ssh since it depends on both the network availability
and the OS health. I'll leave it to you to figure out in how many
ways these two dependencies can hinder a fencing operation.

Thanks,

Dejan


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