[Linux-HA] about the resource stickiness

[Andreas Kurz]

Andreas Kurz wrote:
> Luis Carlos Peinado Bravo wrote:
>> Hello, I have read the web page
>> http://wiki.linux-ha.org/v2/faq/forced_failover and some post about the
>> resource stickiness, resource failure stickiness, forced failover... but
>> I couldn't find the way to get success.
>>
>>  
>>
>> As you can see in my cib file I have 2 nodes and 4 resources in a group.
>> The resource_stickiness=500, resource_failure_stickiness=-100, the score
>> in the rsc_location for node iusslae02=1500 and for iusslae03=1000. When
>> I force failover the resources change the node after 60 failures!!! All
>> this configuration was made using the GUI in the 2.0.7 and I think that
>> maybe it isn't complete at all. 
>>
>>  
>>
>> Could you tell the formula I have to use to get appropriate values for
>> the different stickiness and scores? Could you tell me how are they
>> combined to get a given numbers of failures? Do I have to define the
>> resource stickiness for each resource? I'm very confused about this
>> values.
>>
> 
> Hello!
> 
> I've also had some problems to find out the correct formula, but Andrew
> gave me some hints for using heartbeat 2.0.7 .
> 
> Calculated with your scores:
> 
> node iusslae02, score 1500 (all ressources running):
> 4*(1500*2) + 4*500 = 14000
> 
> node iusslae03, score 1000:
> 4*(1000*2) = 8000
> 
> If I understood right, the Problem in Version 2.0.7 is the
> multiplication of the scores in location constraints, that produces much
> higher scores than expected. In your case factor 2.
> 
> The difference when running on the prefered node 14000-8000=6000, thus
> you need a 60*(-100)=-6000 score from failing resource to get an equal
> weight for both nodes.
> 
> So try e.g a score of 200 and 100 for your nodes and increase your
> resource_failure_stickiness to -500 and the failover should hapen after
> the 5th failure of a ressource.
> 
> Regards,
> Andi

... after the 6th failure should be correct ;-)