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[Qemu-devel] using "qemu-img convert -O qcow2" to convert qcow v1 to v2


From: Peter Maydell
Subject: [Qemu-devel] using "qemu-img convert -O qcow2" to convert qcow v1 to v2 creates a qcow v3 file?
Date: Mon, 13 Nov 2017 17:14:34 +0000

I have a qcow v1 file which I created by mistake (forgetting that
you need to tell qemu-img create 'qcow2' and not just 'qcow'),
which I want to convert to a v2 file so I can put snapshots into
it. But when I try to do this with qemu-img convert it creates a
v3 file instead:

$ file hda-old.qcow
hda-old.qcow: QEMU QCOW Image (v1), 5368709120 bytes
$ build/x86/qemu-img convert -O qcow2 hda-old.qcow hda.qcow2
$ file hda.qcow2
hda.qcow2: QEMU QCOW Image (v3), 5368709120 bytes

and if you then try to use that in QEMU it complains:

qemu-system-aarch64: -drive if=none,file=hda.qcow2,format=qcow,id=hd:
Unsupported qcow version 3

What am I missing here?

thanks
-- PMM



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