[ClusterLabs] how to set a dedicated fence delay for a stonith agent ?

[Kristoffer Grönlund]

"Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> writes:

> ----- On May 8, 2017, at 9:20 PM, Bernd Lentes bernd.lentes at helmholtz-muenchen.de wrote:
>
>> Hi,
>> 
>> i remember that digimer often campaigns for a fence delay in a 2-node  cluster.
>> E.g. here: http://oss.clusterlabs.org/pipermail/pacemaker/2013-July/019228.html
>> In my eyes it makes sense, so i try to establish that. I have two HP servers,
>> each with an ILO card.
>> I have to use the stonith:external/ipmi agent, the stonith:external/riloe
>> refused to work.
>> 
>> But i don't have a delay parameter there.
>> crm ra info stonith:external/ipmi:
>> 
>> ...
>> pcmk_delay_max (time, [0s]): Enable random delay for stonith actions and specify
>> the maximum of random delay
>>    This prevents double fencing when using slow devices such as sbd.
>>    Use this to enable random delay for stonith actions and specify the maximum of
>>    random delay.
>> ...
>> 
>> This is the only delay parameter i can use. But a random delay does not seem to
>> be a reliable solution.
>> 
>> The stonith:ipmilan agent also provides just a random delay. Same with the riloe
>> agent.
>> 
>> How did anyone solve this problem ?
>> 
>> Or do i have to edit the RA (I will get practice in that :-))?
>> 
>> 
>
> crm ra info stonith:external/ipmi says there exists a parameter pcmk_delay_max.
> Having a look in  /usr/lib64/stonith/plugins/external/ipmi i don't find anything about delay.
> Also "crm_resource --show-metadata=stonith:external/ipmi" does not say anything about a delay.
>
> Is this "pcmk_delay_max" not implemented ? From where does "crm ra info stonith:external/ipmi" get this info ?
>

pcmk_delay_max is implemented by Pacemaker. crmsh gets the information
about available parameters by querying stonithd directly.

Cheers,
Kristoffer

>
> Bernd
>  
>
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-- 
// Kristoffer Grönlund
// kgronlund at suse.com