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>  no. afaik, i whish there were a capability to start a compute node as
> disabled.

+1

We do some magic in our flavors so instances go to specific hypervisors. (we have hypervisors with a lot of fast local storage for io intensive instances)
Happy side affect is that unless a hypervisor is in a specific host aggregate it will not spawn machines.
However I would certainly want this to be an option.

Cheers,
Robert van Leeuwen