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> In Essex, you can use 'reserved_host_memory_mb' with the ZoneManager to
> reserve a certain amount of memory per host.

I'm working with Essex milestone 2 and I don't get it to work. I set
the parameter on every compute node.

root at os-compute2:~# grep memory /etc/nova/nova.conf
--reserved_host_memory_mb=1024

root at os-compute2:~# free -m
             total       used       free     shared    buffers     cached
Mem:          2008       1951         56          0          0         48
-/+ buffers/cache:       1902        105
Swap:         2043        774       1269

But actually nova is spinning up 9 instances each using 512MB memory.
What I'm doing wrong?
Do I have to explicit enable the ZoneManager? If yes, how?

Regards