[Pacemaker] why sometimes pengine seems lazy

[Andrew Beekhof]

> On 10 Feb 2015, at 6:50 pm, d tbsky <tbskyd at gmail.com> wrote:
> 
> hi:
>   I was using pacemaker and drbd with sl linux 6.5/6.6. all are fine.
> 
>   now I am tesing sl linux 7.0 and I notice when I want to promote
> the drbd resource with "pcs resource meta  my-ms-drbd master-max=2".
> 
>    sometimes pengine find the change immediately, but sometimes it
> find the change after about a minute. I don't know if the delay is
> normal? I didn't notice the delay when I using sl linux 6.5/6.6.
> 
>   the "good" result. kvm-3-ms-drbd set master-max = 2 at 13:00:07 and
> pengine find it at 13:00:07

[...]

> 
> 
>   the "lazy" result: kvm-2-ms-drbd set master-max = 2 at  12:47:09.
> pengine find it at 12:47:52
> pacemaker seems quite busy.

In a nutshell, this is your answer.
The cluster was busy handling nodes joining and leaving the cluster and wasn't yet ready to act on your change.