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1) Use this command "vgs" to check your default stack volume. In my case, by default I only get 10G for my "stack-volumes-lvmdriver-1" group.

In your case it is probably just 1 G, that's the reason that why you can only create 1 G volume for your instance.

2) If you want to use a loopback device to add as a volume, follow this link:

http://udaraliyanage.wordpress.com/2014/05/23/openstack-increase-volume-capacity/

Be sure to use your own group (In my case it is "stack-volumes-lvmdriver-1" as I get it from "vgs" command).

3) if you are using an external device, you can skip the "pvcreate /dev/loop3" procedure.