[Pacemaker] Fixed! - Re: Problem with dual-PDU fencing node with redundant PSUs

[Digimer]

On 07/01/2013 12:59 PM, Lars Marowsky-Bree wrote:
> On 2013-07-01T12:58:25, Digimer <lists at alteeve.ca> wrote:
> 
>>> Pacemaker can monitor the fencing device if you configure a monitor
>>> action for it, for exactly this reason.
>> My *very* initial testing of op monitor="30" didn't detect the failure
>> or recovery of the fence device. I may very well have screwed something
>> up though... I still have a lot to learn.
> 
> The check should call out to the agent with a status request. I, on the
> other hand, am not familiar with how that works for fence_* agents,
> since I've so far only worked with the cluster-glue based agents.
> 
>> I protect against this scenario by using two switches and plugging IPMI
>> into the first switch and the PDUs into the second switch. All nodes use
>> bonded links with a leg in either switch. So the failure of an entire
>> switch will not cause an interruption or the loss of fencing capabilities.
> 
> Ah, yes, that'd work.
> 
> Though I admit this whole conversation just convinces me more and more
> about prefering to use sbd fencing. ;-) I wonder if you could give it a
> thought?
> 
> It does lack a fence_sbd wrapper (if you want to use it on RHEL w/o the
> rest), but maybe someone feels like contributing one ;-)

I only use fence_*, so the wrapper would need to be there for me to test it.

Tell me about how sbd works, please.

-- 
Digimer
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