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Create a host aggregate that is exposed to users as an availability zone.

Russel has explained it very well here..

http://russellbryantnet.wordpress.com/2013/05/21/availability-zones-and-host-aggregates-in-openstack-compute-nova/

As far as API is concerned..

v2/​{tenant_id}​/os-aggregates

JSON Request:

{ "aggregate": { "name": "name", "availability_zone": "nova" } }

You can create an aggregate and availability zone together...Then add hosts to the aggregates.

refer API doc on aggregates for details..

http://api.openstack.org/api-ref-compute-ext.html