[Qemu-devel] qemu-img: error while reading

[Klaus Fuerstberger]

Hello,

as I already posted in the forum, I'm not able to convert a qcow2 image 
to raw format. See http://qemu-forum.ipi.fi/viewtopic.php?f=4&t=4391

# qemu-img info catinst_c.img
image: catinst_c.img
file format: qcow2
virtual size: 70G (75161927680 bytes)
disk size: 30G
cluster_size: 4096

I try to convert the image:
# qemu-img convert -f qcow2 -O raw catinst_c.img /tmp/catinst_c.raw
qemu-img: error while reading

The resulting image is not completly converted:
# qemu-img info /tmp/catinst_c.raw
image: /tmp/catinst_c.raw
file format: raw
virtual size: 70G (75161927680 bytes)
disk size: 9.7G

This is always reproducable.

qemu-img version 0.9.1 from the kvm-70 package from
http://mesh.dl.sourceforge.net/sourceforge/kvm/kvm-70.tar.gz

The image is an NTFS one, with no filesystem errors. But sometimes the 
image gets corrupt (I dont know why?), and I have to use my backup. 
Maybe the reason for this is some error in the image and also the reason 
for failing to convert?

How can I repair/convert this image?

Many thanks!
Klaus