[Pacemaker] Stonith: How to avoid deathmatch cluster partitioning

[Digimer]

On 05/15/2013 09:34 AM, Klaus Darilion wrote:
> On 15.05.2013 14:51, Digimer wrote:
>> On 05/15/2013 08:37 AM, Klaus Darilion wrote:
>>> primitive st-pace1 stonith:external/xen0 \
>>>          params hostlist="pace1" dom0="xentest1" \
>>>          op start start-delay="15s" interval="0"
>>
>> Try;
>>
>> primitive st-pace1 stonith:external/xen0 \
>>          params hostlist="pace1" dom0="xentest1" delay="15" \
>>          op start start-delay="15s" interval="0"
>>
>> The idea here is that, when both nodes lose contact and initiate a
>> fence, 'st-pace1' will get a 15 second reprieve. That is, 'st-pace2'
>> will wait 15 seconds before trying to fence 'st-pace1'. If st-pace1 is
>> still alive, it will fence 'st-pace2' without delay, so pace2 will be
>> dead before it's timer expires, preventing a dual-fence. However, if
>> pace1 really is dead, pace2 will fence it and recovery, just with a 15
>> second delay.
>
> Sounds good, but pacemaker does not accept the parameter:
>
>     ERROR: st-pace1: parameter delay does not exist
>
> The syntax suggested by you assumes that "delay" is a parameter accepted
> by the stonith resource. But this is not the case. Also "grep delay
> /usr/lib/stonith/plugins/external/*" does not reveal a single stonith
> resource which accepts this parameter.
>
> Further, it would make sense to have "delay" as Pacemaker parameter. I
> also tried
>    primitive st-pace1 stonith:external/xen0 delay="15" \
>          params hostlist="pace1" dom0="xentest1" \
>          op start start-delay="15s" interval="0"
> but this also gives syntax errors.
>
> Any other hints?
>
> thanks
> Klaus

Ah, sorry. I come from the RHCS world and I believe 'delay' is valid for 
all of their fence agents. These are Xen VMs? Perhaps  'fence_virsh' or 
'fence_xvm' would work? The agent's man page might provide guidance.

-- 
Digimer
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