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Placement of VM instance upon initialisation/migration

Hi guys,

Does anybody know if OpenStack has any specific strategy/algorithm for placing newly created/migrated VM into Compute node? I can observe that it tries to balance the resources (cpu, memory, storage) among available compute nodes.

So if user wants to place VM instance so as to reduce the communication costs (intra- instead of inter-compute node), he/she has to do it manually (i suppose manual selection of hypervisor is possible?)

Is there any algorithm that OS applies to optimise this?