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

[Lars Marowsky-Bree]

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 ;-)


Regards,
    Lars

-- 
Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde