[Linux-HA] about the resource stickiness

[Andreas Kurz]

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