Hi,
On Tue, Apr 06, 2010 at 05:00:16PM -0600, Greg Woods wrote:
> On Tue, 2010-04-06 at 14:58 -0700, Tony Gan wrote:
>
> > I think the solution is using UPS or PDU for STONITH device.
>
> That could improve things in some scenarios, but it does not completely
> solve the problem. The cluster is still vulnerable to having the entire
> power strip for one node unlpugged or turned off. No matter what the
> stonith device is, there is always the possibility of failure of the
> stonith device itself. My goal is to be able to recover from something
> like these remotely, before I can actually get there to correct the real
> problem.
>
> In fact, the chance that stonith will fail because one of the nodes has
> completely lost power due to hardware failure while the other one still
> has power is extremely small. They both have dual power supplies and
> they both use the same two circuits, so the only way that is at all
> likely where I could get into the state I am concerned about would be
> human error. Unfortunately we do have a lot of people with machine room
> access, which makes the possibility of someone powering off the wrong
> machine by mistake a real possibility. The chance that two power
> supplies would fail at the same time is remote. Unfortunately, human
> error is also possible using a controllable power strip as the stonith
> device; that doesn't really solve my problem.
>
> I do think I found something that might work. I'm not sure yet, but it
> looks like I can create a stonith:meatware resource in addition to the
> stonith:ipmilan resource. That would allow me to manually confirm that
> the powerless node is in fact dead and have the remaining node take
> over. That confirmation can be done by logging in to the live node
> remotely, so it will serve my needs if I can figure out the magic
> incantation to configure this correctly.
There's not much magic, you just configure two stonith resources
and assign different priority, then they'll be tried in a
round-robin fashion. For instance:
primitive st-real stonith:ipmilan \
params ... priority=10 # it will try this one first
primitive st-real stonith:meatware \
params ... priority=20
Thanks,
Dejan
> --Greg
>
>
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