Hi Edward,

Are you using Simple.Scheduler? I think it must be related to max_cores
option.

max_cores default value is 16, you can override it in nova.conf

max_cores = 24

cpu_allocation_ratio (vCPU/CPU ratio) default value is 1, if you want to
use more virtual cores:

cpu_allocation_ratio = ...

See:
http://docs.openstack.org/trunk/openstack-compute/admin/content/simple.html
http://docs.openstack.org/trunk/openstack-compute/admin/content/corefilter.html

Alberto


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