Open Stack

All, i am a newbi to the openstack. I am trying to create a QCOW2 image from a Centos Linux installation iso and ran into the a road block. This is what I did so far (just followed the admin manual for Openstack).
 
IMAGE=centos-6.2.img
$ qemu-img create -f raw $IMAGE 5G
 
 VNCDISPLAY=:2
$ MONITOR=/tmp/file.mon
$ sudo  /usr/libexec/qemu-kvm -m 1024 -drive file=${IMAGE},if=virtio,index=0 \
-boot c -net nic -net user -nographic -vnc ${VNCDISPLAY} \
-monitor unix:${MONITOR},server,nowait
 
I have the distribution iso on the local directory of the user. 
 
I got the following error. what am i missing here?
 
qemu-kvm: -drive file=centos-6.2.img,if=virtio,index=0: could not open disk image centos-6.2.img:Operation not supported
 
Any help is appreciated.
 
AK
 
  		 	   		  
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