[Openstack] Four compute-node, everytime the 1st and 2nd are choosen

[Razique Mahroua]

Hl all, 
I've four compute-nodes, around 20 instances runing.
I've four nodes registered to nova-scheduler (nova-manage shows them)
but everytime I spawn a new instance, the 3rd an 4th node are never choosen for 
the instances.
the ressources are the same on the nodes (around 24gb of ram), they are idle, 
and available.
Can I force the scheduler to use them for an instance ?
Thanks
Razique - doc team -
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