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qemu-img is not able to use information from the image metadata (like the information in qemu-img map).  This information can be used to speed up conversion of images.

Example:
$ qemu-img create prova.img 1G
Formatting 'prova.img', fmt=raw size=1073741824 

Without feature:
$ time qemu-img convert -f raw -O raw -t none prova.img prova2.img
real	0m0.504s
user	0m0.129s
sys	0m0.347s

With feature:
$ time ./qemu-img convert -f raw -O raw -t none prova.img prova2.img
real	0m0.281s
user	0m0.002s
sys	0m0.009s

The effect is even more visible with the "-p" option to qemu-img.

Reproduce and verify this issue with the same steps as comment #0.

# qemu-img create prova.img 1G
Formatting 'prova.img', fmt=raw size=1073741824 
# qemu-img info prova.img 
image: prova.img
file format: raw
virtual size: 1.0G (1073741824 bytes)
disk size: 0

With the unfixed qemu-kvm version:
# rpm -q qemu-kvm
qemu-kvm-1.5.3-30.el7.x86_64

# time qemu-img convert -f raw -O raw -t none prova.img prova1.img

real	0m0.435s
user	0m0.058s
sys	0m0.308s

With the fixed qemu-kvm version:
# rpm -q qemu-kvm
qemu-kvm-1.5.3-38.el7.x86_64

# time qemu-img convert -f raw -O raw -t none prova.img prova2.img

real	0m0.024s
user	0m0.002s
sys	0m0.001s

Base on above, this issue has been fixed correctly. Move to VERIFIED status.

Best Regards,
sluo

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.